Get image blob return empty string #606
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The signature of the function tells us that getImageBlob() always return string or throws Exception. In this case, the returning value is NULL as retval is unset.
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This PR is instead of #588, against the proper branch.
The signature of the function tells us that getImageBlob() always returns a string or throws an Exception.
In this case, the returning value is NULL as retval is unset.