Better handling of ParsingErrors in plot result

plot_all.py

@@ -257,9 +257,13 @@ class PlotAllCli:
                 cprint(f"⨯ {err}", file=sys.stderr, color="red")
 
                 with err_output_file.open("w") as file:
-                    print(err, file=file)
+                    print(
+                        f"{err.trace.input_file.relative_to(self._current_log_dir)}:",
+                        err.msg,
+                        file=file,
+                    )
 
-                rets.append(str(err))
+                rets.append(err.msg)
 
                 continue