More robust error checking

[ChrisRackauckas]

No description provided.

[coveralls]

Changes Unknown when pulling 35e0c99 on ChrisRackauckas-patch-1 into ** on master**.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@ebf31c4). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #28   +/-   ##
=========================================
  Coverage          ?   86.29%           
=========================================
  Files             ?        4           
  Lines             ?      197           
  Branches          ?        0           
=========================================
  Hits              ?      170           
  Misses            ?       27           
  Partials          ?        0

Impacted Files	Coverage Δ
src/common.jl	87.96% <100%> (ø)

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