show readable error message when applying patch without (extracted) source #4738
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…ource When there is no source `self.src` is an empty list which leads to a rather generic error message. Improve that by showing that there was no source to apply the patch to. For extensions `self.src` is set to a string as only a single source is supported. Accessing `self.src[0].['finalpath']` leads to an error > TypeError: string indices must be integers This happens when the source didn't got extracted so `self.ext_dir` and hence `beginpath` will be `None`. Make the error show that the source was not extracted.
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When there is no source
self.srcis an empty list which leads to a rather generic error message. Improve that by showing that there was no source to apply the patch to.For extensions
self.srcis set to a string as only a single source is supported.Accessing
self.src[0].['finalpath']leads to an errorWhile doing that get rid of
patch['source']which can never be set as it would trigger a failure increate_patch_infoas it isn't specified as an allowed key. It isn't useful anyway as only the first source will have itsfinalpathset correctly, the other, when unpacked to the same folder, are just referring to that folder instead of their subfolder.