Check that the id and redshift columns are present in the input file. Freely...

Check that the id and redshift columns are present in the input file. Freely inspired from an initial patch written by Denis.

pcigale/session/configuration.py

@@ -158,8 +158,15 @@ class Configuration(object):
         with Database() as base:
             filter_list = base.get_filter_list()[0]
 
-        # Finding the known filters in the data table
         obs_table = read_table(self.config['data_file'])
+
+        # Check that the id and redshift columns are present in the input file
+        if 'id' not in obs_table.columns:
+            raise Exception("Column id not present in input file")
+        if 'redshift' not in obs_table.columns:
+            raise Exception("Column redshift not present in input file")
+
+        # Finding the known filters in the data table
         column_list = []
         for column in obs_table.columns:
             filter_name = column[:-4] if column.endswith('_err') else column