AUP3: Remove unneeded error message

src/ProjectFileManager.cpp

@@ -97,8 +97,7 @@ const Pair helpURLTable[] = {
       "mismatched tag",
       "#mismatched"
    },
-// These two errors with FAQ entries are reported elsewhere, not here....
-//#[[#import-error|Error Importing: Aup is an Audacity Project file. Use the File > Open command]]
+// This error with FAQ entry is reported elsewhere, not here....
 //#[[#corrupt|Error Opening File or Project: File may be invalid or corrupted]]
 };
 

src/import/Import.cpp

@@ -797,15 +797,6 @@ bool Importer::Import( AudacityProject &project,
          return false;
       }
 
-      // Audacity project
-      if (extension.IsSameAs(wxT("aup3"), false)) {
-         errorMessage = XO(
-/* i18n-hint: %s will be the filename */
-"\"%s\" is an Audacity Project file. \nUse the 'File > Open' command to open Audacity Projects.")
-            .Format( fName );
-         return false;
-      }
-
       if( !wxFileExists(fName)){
          errorMessage = XO( "File \"%s\" not found.").Format( fName );
          return false;