Rescue NameError in formatter#94
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* Fixes Hirb breaking when rendering arrays of items where the item type is not the same
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So when Hirb tries pretty-print my lists, which are very often not intended to be tables (but happen to contain an AR object) it consistently breaks without recourse. It would be nicer to rescue in the render method than to swallow the whole block - but I'm not sure there is a very neat way to do that, since each formatter defines it's own renderer.