improve error when solving for empty series - add update kwarg to get_sim_index and observations - simplify code in those methods as sim_index and oseries_calib now exist after initialize - set oseries_calib and sim_index in initialize - add check in solve() for empty oseries_calib
improve error when solving for empty series
- add update kwarg to get_sim_index and observations
- simplify code in those methods as sim_index and
oseries_calib now exist after initialize
- set oseries_calib and sim_index in initialize
- add check in solve() for empty oseries_calib

pastas/pasta,pastas/pastas,gwtsa/gwtsa