ISEPOS-2941 Handle empty input error

src/Mmax.py

@@ -37,6 +37,9 @@ def main(Input_catalog, Input_injection_rate, time_win_in_hours, time_step_in_ho
     from util.CandidateEventsTS import CandidateEventsTS
     from util.M_max_models import M_max_models
 
+    if Input_injection_rate is empty:
+        raise ValueError("Input_injection_rate contains empty value") 
+
     def latlon_to_enu(lat, lon, alt):
         lat0 = np.mean(lat)
         lon0 = np.mean(lon)