Propertyconstraintexception is unchecked

[spyros87]

#63

[coveralls]

Coverage increased (+0.6%) to 56.223% when pulling e7f78cf on spyros87:propertyconstraintexception-is-unchecked into c228e88 on ChargeTimeEU:master.

[codecov-io]

Codecov Report

Merging #65 into master will increase coverage by 0.63%.
The diff coverage is 75.42%.

@@             Coverage Diff              @@
##             master      #65      +/-   ##
============================================
+ Coverage     52.82%   53.46%   +0.63%     
- Complexity      787      812      +25     
============================================
  Files           180      180              
  Lines          3061     3045      -16     
  Branches        221      211      -10     
============================================
+ Hits           1617     1628      +11     
+ Misses         1359     1333      -26     
+ Partials         85       84       -1

[spyros87]

@TVolden The PR is ready for review.

[TVolden]

Good work.
I'm not a big fan of testing specific text, especially for an exception. It's subject to change and doesn't add allot of value to the test.
Other than that, everything looks fine.