fixed empty output exception as it did not print the config file path

acmc/phen.py

@@ -380,10 +380,10 @@ def preprocess(df, file, target_code_type=None, codes_file=None, translate=True,
 	
 	if target_code_type and not translate:
 		# QA only on target codes
-		if target_code_type in file[columns]:
+		if target_code_type in file['columns']:
 			logger.info(f"Processing {target_code_type} Codes...")
 			out = preprocess_code(out=out,
-								  codes=df[file[columns][target_code_type]].dropna(),
+								  codes=df[file['columns'][target_code_type]].dropna(),
 								  codes_file=codes_file,
 								  checker=parse.code_types[target_code_type],
 								  output_col=target_code_type,
@@ -534,7 +534,7 @@ def map(phen_dir, target_code_type, translate=True):
 
 	# test if there's any output from processing
 	if len(out.index) == 0:
-		raise Exception("The output after map processing has no output, check configuration file {str(config_path.resolve())} is not empty")
+		raise Exception(f"No output after map processing, check configuration {str(config_path.resolve())}")
 
 	# Final processing
 	out = out.reset_index(drop=True)