reject bad urls

[GlazerMann]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@7a9402c). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #2210   +/-   ##
=========================================
  Coverage          ?   73.66%           
  Complexity        ?     2495           
=========================================
  Files             ?       12           
  Lines             ?     5328           
  Branches          ?        0           
=========================================
  Hits              ?     3925           
  Misses            ?     1403           
  Partials          ?        0

Impacted Files	Coverage Δ	Complexity Δ
zotero.php	73.36% <100%> (ø)	0 <0> (?)

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