Don't re-read tokens on error

If the data were empty, there is no token, so curTok will represent the
right paren, not the next token

Fixes https://gitlab.com/kicad/code/kicad/-/issues/20301

(cherry picked from commit d2550138bc)

common/embedded_files.cpp

@@ -390,8 +390,10 @@ void EMBEDDED_FILES_PARSER::ParseEmbedded( EMBEDDED_FILES* aFiles )
                 catch( const PARSE_ERROR& e )
                 {
                     // No data in the file -- due to bug in writer for 9.0.0
-                    NeedRIGHT();
-                    break;
+                    if( curTok == T_RIGHT )
+                        break;
+                    else
+                        throw e;
                 }
                 catch( ... )
                 {