Adding exceptions around image solving

[wtgee]

This catches the thrown exception but doesn't deal with a hanging subprocess. Was having troubles locating where that was coming from as all the current subprocess should have timeouts that handle them.

Closes #111

[codecov]

Codecov Report

Merging #112 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #112   +/-   ##
========================================
  Coverage    84.39%   84.39%           
========================================
  Files           35       35           
  Lines         2345     2345           
  Branches       281      281           
========================================
  Hits          1979     1979           
  Misses         285      285           
  Partials        81       81

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[jamessynge]

Approved, but does this really solve #111?