Update 'src/app/core/application/header-menu.js'

Fixed bug on "header-menu.js!onFileChanged()" that was supposing to exist the tag id="messages" on "src/index.html", when load GEO file.
Introduced security to circumvent the error, even when missign 'messages' on "src/index.html".
After: var element = document.getElementById("messages");
I changed "element.innerHTML = "Construct inside area *";" by the 7 lines bellow:
  if (element != undefined) { // security (case id="messages" was removed from "src/index.html"
    console.log("header-menu.js!onFileChanged(): [2.2] element=" + element);
    element.innerHTML = "Construct inside area *"; // same text in "index.html"
    auxEr += "[2.2] ";
    }
  else
    console.log("header-menu.js!onFileChanged(): [2.2] Error: src/index.html missing id=messages!");

src/app/core/application/header-menu.js

@@ -8,6 +8,7 @@
  * Treat actions associated to iGeomJS menu (File | Edit)
  *
  * ./app/core/application/header-menu.js
+ * @version 2025/03/25: Fixed reading any GEO file (treat tag "messages" in "src/index.html")
  * @version 2023/07/14: Fixed reading GEO file with midpoint
  */
 
@@ -78,32 +79,40 @@ class HeaderMenu {
       console.log("header-menu.js!onload(): starts"); //D
       var obj_file_parser = "-1", content_map = "-1", orchestrator = "-1";
       try {
-        auxEr += " 1, ";
+        auxEr += " [1] ";
         if (obj_file_reader) {
           str_file_content = obj_file_reader.result; // get
-          auxEr += "2, "; console.log("* #str_file_content=" + (str_file_content?str_file_content.length:0) + ", str_file_content = " + str_file_content);
+          auxEr += "[2] "; console.log("* #str_file_content=" + (str_file_content?str_file_content.length:0) + ", str_file_content = " + str_file_content);
           }
 
+        // src/index.html: must have tag <li><span class="level-1" id="messages">iGeom version</span></li>
         var element = document.getElementById("messages"); // overwrite the message "File does not exist or it is empty""
-        element.innerHTML = "Construct inside area *"; // same text in "index.html"
+        auxEr += "[2.1] ";
+        if (element != undefined) { // security (case id="messages" was removed from "src/index.html"
+          console.log("header-menu.js!onFileChanged(): [2.2] element=" + element);
+          element.innerHTML = "Construct inside area *"; // same text in "index.html"
+          auxEr += "[2.2] ";
+          }
+        else
+          console.log("header-menu.js!onFileChanged(): [2.2] Error: src/index.html missing id=messages!");
 
         obj_file_parser = new FileParser(str_file_content); // app/core/parser/file-parser.js: export class FileParser: only set "this.content = str_file_content"
-        auxEr += "3, ";
+        auxEr += "[3] ";
 
         content_map = obj_file_parser.parse(vec_obj_dynamic_obj); // now parse each line producing a JS Map (additionally produce array "vec_obj_dynamic_obj")
-        auxEr += "4, ";
+        auxEr += "[4] ";
 
         var aux = ""; // try { aux = JSON.stringify(Object.keys(content_map)) + " "; } catch (error) { aux = "error " + error + " "; }
-        auxEr += "5, "; // content_map = [id,1=type,0] [id,2=type,0] [id,3=type,13] [id,4=type,0] [id,5=type,13] [undefined=undefined] 
+        auxEr += "[5] "; // content_map = [id,1=type,0] [id,2=type,0] [id,3=type,13] [id,4=type,0] [id,5=type,13] [undefined=undefined] 
         console.log("* #content_map=" + (content_map?content_map.length:0) + "=" + content_map.size + ", content_map = " + HeaderMenu.printMap_hm(content_map)); //D JSON.stringify(content_map) + "\n" + aux);
         orchestrator = new ParserOrchestrator(content_map); // app/core/parser/parser-orchestrator.js
-        auxEr += "6, "; console.log("* #orchestrator=" + (orchestrator?orchestrator.length:0) + ", orchestrator = " + orchestrator);
-        auxEr += "7, ";
+        auxEr += "[6] "; console.log("* #orchestrator=" + (orchestrator?orchestrator.length:0) + ", orchestrator = " + orchestrator);
+        auxEr += "[7] ";
         orchestrator.orchestrate(vec_obj_dynamic_obj); // Array() with {id, obj}
         }
       catch (error) {
-        console.log("header-menu.js!onFileChanged()!obj_file_reader.onload: error " + error + // "\n * str_file_content = " + str_file_content + "\n * obj_file_parser = " + JSON.stringify(obj_file_parser) + "\n * content_map = " + JSON.stringify(content_map));
-          auxEr);
+        console.log("header-menu.js!onFileChanged()!obj_file_reader.onload: error " + error +  auxEr);
+	// "\n * str_file_content = " + str_file_content + "\n * obj_file_parser = " + JSON.stringify(obj_file_parser) + "\n * content_map = " + JSON.stringify(content_map));
         }
       HeaderMenu.printObj_hm(vec_obj_dynamic_obj); //D only DEBUG!
       console.log("header-menu.js!onload(): final"); //D