fix(iteration): prevent IntegerDivisionByZeroException with SETPOS

[jonasbadstuebner]

Closes: #44

The problem is, if you go by month, it iterates over every day of every month, starting with January. In the provided example, no day of year in January (1-31) matches any date in the dateset, therefore dateIndices is empty and it throws a IntegerDivisionByZeroException when using dateIndices.length on the right hand side of the modulo operator in set_positions_list.dart.

rrule/lib/src/iteration/set_positions_list.dart

Line 33 in f557fe9

final dateIndex = dateIndices[datePosition % dateIndices.length];

This PR fixes the problem by just moving on.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f557fe9) 87.90% compared to head (e8fb5fa) 87.90%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #67   +/-   ##
=======================================
  Coverage   87.90%   87.90%           
=======================================
  Files          21       21           
  Lines        1281     1282    +1     
=======================================
+ Hits         1126     1127    +1     
  Misses        155      155           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[JonasWanke]

Thanks for this fix! It's published as part of v0.2.15