Add check to see if sample ID is available in metadata file exactly o…

…nce or report an error when annotating H5AD file with sample info.

Add check to see if sample ID is available in metadata file exactly once
or report an error when annotating H5AD file with sample info.

src/utils/bin/sc_h5ad_annotate_by_sample_metadata.py

@@ -63,7 +63,14 @@
     raise Exception("VSN ERROR: The meta data TSV file expects a header with a required 'id' column.")
 
 if args.type == "sample":
-    for (column_name, column_data) in metadata[metadata.id == SAMPLE_NAME].iteritems():
+    sample_info = metadata[metadata.id == SAMPLE_NAME]
+
+    if len(sample_info) == 0:
+        raise Exception(f"VSN ERROR: The meta data TSV file does not contain sample ID '{SAMPLE_NAME}'.")
+    elif len(sample_info) > 1:
+        raise Exception(f"VSN ERROR: The meta data TSV file contains more than one line with sample ID '{SAMPLE_NAME}'.")
+
+    for (column_name, column_data) in sample_info.iteritems():
         adata.obs[column_name] = column_data.values[0]
 else:
     raise Exception("VSN ERROR: This meta data type {} is not implemented".format(args.type))