UnboundLocalError: local variable 'xml' referenced before assignment

[nemobis]

Analysing http://www.aroundisleofwight.info/api.php
Loading config file...
Resuming previous dump process...
Title list was completed in the previous session
XML is corrupt? Regenerating...
http://www.aroundisleofwight.info/api.php
    In attempt 1, XML for "Main_Page" is wrong. Waiting 20 seconds and reloading...
    In attempt 2, XML for "Main_Page" is wrong. Waiting 40 seconds and reloading...
    In attempt 3, XML for "Main_Page" is wrong. Waiting 60 seconds and reloading...
    In attempt 4, XML for "Main_Page" is wrong. Waiting 80 seconds and reloading...
    We have retried 5 times
    MediaWiki error for "Main_Page", network error or whatever...
    Trying to save only the last revision for this page...
    In attempt 1, XML for "Main_Page" is wrong. Waiting 20 seconds and reloading...
    In attempt 2, XML for "Main_Page" is wrong. Waiting 40 seconds and reloading...
    In attempt 3, XML for "Main_Page" is wrong. Waiting 60 seconds and reloading...
    In attempt 4, XML for "Main_Page" is wrong. Waiting 80 seconds and reloading...
    We have retried 5 times
    MediaWiki error for "Main_Page", network error or whatever...
    Saving in the errors log, and skipping...
Trying the local name for the Special namespace instead
    In attempt 1, XML for "Main_Page" is wrong. Waiting 20 seconds and reloading...
    In attempt 2, XML for "Main_Page" is wrong. Waiting 40 seconds and reloading...
    In attempt 3, XML for "Main_Page" is wrong. Waiting 60 seconds and reloading...
    In attempt 4, XML for "Main_Page" is wrong. Waiting 80 seconds and reloading...
    We have retried 5 times
    MediaWiki error for "Main_Page", network error or whatever...
    Trying to save only the last revision for this page...
    In attempt 1, XML for "Main_Page" is wrong. Waiting 20 seconds and reloading...
    In attempt 2, XML for "Main_Page" is wrong. Waiting 40 seconds and reloading...
    In attempt 3, XML for "Main_Page" is wrong. Waiting 60 seconds and reloading...
    In attempt 4, XML for "Main_Page" is wrong. Waiting 80 seconds and reloading...
    We have retried 5 times
    MediaWiki error for "Main_Page", network error or whatever...
    Saving in the errors log, and skipping...
Traceback (most recent call last):
  File "./dumpgenerator.py", line 2323, in <module>
    main()
  File "./dumpgenerator.py", line 2313, in main
    resumePreviousDump(config=config, other=other)
  File "./dumpgenerator.py", line 1966, in resumePreviousDump
    config=config, titles=titles, session=other['session'])
  File "./dumpgenerator.py", line 731, in generateXMLDump
    header, config = getXMLHeader(config=config, session=session)
  File "./dumpgenerator.py", line 508, in getXMLHeader
    header = xml.split('</mediawiki>')[0]
UnboundLocalError: local variable 'xml' referenced before assignment
tail: cannot open ‘aroundisleofwightinfo-20200208-wikidump/aroundisleofwightinfo-20200208-history.xml’ for reading: No such file or directory
No </mediawiki> tag found: dump failed, needs fixing; resume didn't work. Exiting.

[nemobis]

The error in the subject can be fixed, but the specific wiki is broken, not our fault: http://www.aroundisleofwight.info/api.php?action=query&export=1&exportnowrap=1&titles=Main_page gives

<api servedby="server3.prescientsoftware.co.uk">
<error code="internal_api_error_MWException" info="Exception Caught: Internal error in ApiFormatRaw::getMimeType: No MIME type set for raw formatter" xml:space="preserve">
#0 /var/www/webapps/iow/includes/api/ApiBase.php(1111): wfDebugDieBacktrace('Internal error ...') #1 /var/www/webapps/iow/includes/api/ApiFormatRaw.php(56): ApiBase::dieDebug('ApiFormatRaw::g...', 'No MIME type se...') #2 /var/www/webapps/iow/includes/api/ApiFormatBase.php(140): ApiFormatRaw->getMimeType() #3 /var/www/webapps/iow/includes/api/ApiMain.php(689): ApiFormatBase->initPrinter(false) #4 /var/www/webapps/iow/includes/api/ApiMain.php(669): ApiMain->printResult(false) #5 /var/www/webapps/iow/includes/api/ApiMain.php(339): ApiMain->executeAction() #6 /var/www/webapps/iow/includes/api/ApiMain.php(323): ApiMain->executeActionWithErrorHandling() #7 /var/www/webapps/iow/api.php(104): ApiMain->execute() #8 {main}
</error>
</api>