Adapt render_snippet exceptions for py3 #5171
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ckan.lib.render_snippetmakes multiple attempts to find a template for rendering and, if failed, throws an exception from the last attempt. Previously it was handled by creating a function-scoped variable outside thetryblock and it was overridden byexceptblock.In python 3, variable that stores caught exception implicitly unset right after
try/catchso this gives un undefined variable. This PR adapts existing logic so that it works in both versions of python