include Sunday and warn if big but finite

Author: dsweber2

_delphi_utils_python/delphi_utils/weekday.py

@@ -41,9 +41,15 @@ def get_params(data, denominator_col, numerator_cols, date_col, scales, logger):
                 logger.error("Unable to calculate weekday correction")
             else:
                 params[i,:] = result
-        if np.exp(-params).max() == np.inf:
+        # the values multiplied by in calc_adjustment
+        # Sunday, the last day here, is a sum of the other days
+        effective_multipliers = np.exp(np.concatenate([-params[:,:6], params[:,:6].sum(axis=0, keepdims = True)]))
+
+        if effective_multipliers.max() == np.inf or effective_multipliers.min() == -np.inf:
             logger.warning("largest weekday correction is infinite. Defaulting to no correction")
             params = np.zeros((nums.shape[1], X.shape[1]))
+        else if effective_multipliers.max() > 1000:
+            logger.warning("largest weekday correction is over a factor of 1000. This is probably an error, but may be associated with a zero value.")
         return params
 
     @staticmethod