Fix variable scope in EXTENDS management

[nvuillam]

quick build
TEST_KEYWORDS=config

[nvuillam]

🦙 MegaLinter status: ⚠️ WARNING

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[bdovaz]

@nvuillam why this change? I changed it on purpose to make the assert more specific since there are more than one error that starts with "Unable to retrieve EXTENDS config file" so the assert is no longer so specific and can catch an error that is not the one you are looking for.

[nvuillam]

@bdovaz there was a bug (variable scope -> use a variable never declared), I solved it, and the test case did not work anymore... and I did not have the time ^^
If you want to put a better test, please be my guest :)