Uncaught exception when file not existing

In gotodir target, when specifying files_included_from, those files are not checked for existence. The check should be done and the anomaly reported in gotodir.py:203

The issue points to gotodir.py line 203. Start by examining the gotodir target and the files_included_from handling. Look for where file existence is validated and add a check before line 203. Run any existing tests for gotodir to ensure the anomaly is reported correctly.

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