Only add excludes to find command if it's defined #9
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If excludes is not set in the yaml, or set to "", then the following error occurs:
/entrypoint.sh: line 44: local: `': not a valid identifier
When excludes is empty, it causes handling of the for loop over its contents to fail. To prevent this, check that the variable is non-empty prior to looping over its contents.
In addition to this fix, document this feature in the readme and fix some typos there.
Fixes #7