noosfero | Changes on metadata plugin (#444)

[Antonio Terceiro]

New comment for Merge Request 444

https://gitlab.com/noosfero/noosfero/merge_requests/444#note_826812


Antonio Terceiro

`rescue` without an exception type will hide any errors, I don't think that is a good idea.

All this usage of `proc` makes me think that `metadata_spec` should probably take a block instead of hash, so that _all_ tag values could be evaluated at runtime, instead of sprinkling several procs everywhere.

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