Fix alignment between DLD data and external pulse information

[philsmt]

While most people use the DLD's internal pulse information, the component also supports supplying a PulsePattern object from the outside. Then, it may be necessary to align them.

The code supposed to handle that was unfortunately not working properly, as restricting entry_counts to only those rows with data before can easily cause the condition below to not properly activate. As a matter of fact, the test written for exactly this line hapened to pass because while it contained more trains, those had no pulses...

@bj-s

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.92%. Comparing base (9544407) to head (68eb929).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #263      +/-   ##
==========================================
- Coverage   73.93%   73.92%   -0.01%     
==========================================
  Files          23       23              
  Lines        2996     2995       -1     
==========================================
- Hits         2215     2214       -1     
  Misses        781      781              

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