Implement error message for missing ne_file

Added error handling for missing 'ne_file' when using Avalanching.

Author: Sierd

aeolis/inout.py

@@ -117,6 +117,13 @@ def read_configfile(configfile, parse_files=True, load_defaults=True):
     # set default for nsavetimes, if not given
     if 'nsavetimes' in p and not p['nsavetimes']:
         p['nsavetimes'] = int(p['dzb_interval']/p['dt'])
+
+    # catch some incompatible parameter combinations.
+    if (p['ne_file'] is None) and (p['process_avalanche'] == True):
+        print('Please provide a valid ne_file path in the configuration file when using Avalanching.')
+        print('Code does not proceed until this is provided.')
+        print('Hint: If you do not have a ne_file, you can create one with all zeros, with the same dimensions as your grid.')        
+        exit("Exiting due to error")       
 
     return p
 
@@ -603,4 +610,4 @@ def output_sedtrails(s, p):
         savemat(os.path.join('sedtrails_output', str(int(time)).zfill(12) + '.mat'), mdic)
     else:
         mdic = {'us': us, 'un': un, 'dzb': dzb, 'pickup': pickup}
-        savemat(os.path.join('sedtrails_output', str(int(time)).zfill(12) + '.mat'), mdic)
+        savemat(os.path.join('sedtrails_output', str(int(time)).zfill(12) + '.mat'), mdic)