WIP: Fix loading home gait error

[BasVolkers]

Closes PM-219

Description

Fixes error with loading home gait

Changes

Added check that every joint does not have one setpoint

Testing

[codecov]

Codecov Report

Merging #108 into develop will decrease coverage by 0.11%.
The diff coverage is 54.54%.

@@             Coverage Diff             @@
##           develop     #108      +/-   ##
===========================================
- Coverage    72.33%   72.21%   -0.12%     
===========================================
  Files           17       17              
  Lines         1623     1634      +11     
  Branches       176      177       +1     
===========================================
+ Hits          1174     1180       +6     
- Misses         404      408       +4     
- Partials        45       46       +1     

Flag	Coverage Δ
#production	54.36% <0.00%> (-0.23%)	⬇️
#test	98.48% <85.71%> (-0.14%)	⬇️

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Impacted Files	Coverage Δ
...ch_rqt_gait_generator/gait_generator_controller.py	83.62% <0.00%> (-1.21%)	⬇️
...r/test/nosetests/gait_generator_controller_test.py	98.61% <85.71%> (-0.26%)	⬇️

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