A workaround for unfixable header keys in ImageFileCollection

AUTHORS.rst

@@ -65,6 +65,7 @@ Alphabetical list of code contributors
 * Nathan Walker (@walkerna22)
 * Benjamin Weiner (@bjweiner)
 * Jiyong Youn (@hletrd)
+* Michael Gully-Santiago (@gully)
 
 Additional contributors
 -----------------------

CHANGES.rst

@@ -130,6 +130,8 @@ Bug Fixes
 - Logging now preserves all of the arguments when the keyword argument
   names are not used. [#756]
 
+- Workaround malformed header keyword names  [#743]
+
 2.1.0 (2019-12-24)
 ------------------
 

ccdproc/image_collection.py

@@ -624,6 +624,16 @@ def _fits_summary(self, header_keywords):
                                file_path, e)
                 continue
 
+        ## Bugfix: Unfixable header keywords sometimes yield duplicate
+        # entries (probably arises the `_dict_from_fits_header` above)
+        # For now just check if there are more values than files and
+        # if so, fill with None for now.
+        if summary_dict is not None:
+            for key in summary_dict.keys():
+                if len(summary_dict[key]) > len(summary_dict['file']):
+                    logger.warning('malformed header keyword %s cannot be understood.',key)
+                    summary_dict[key] = [None]*len(summary_dict['file'])
+
         summary_table = Table(summary_dict, masked=True)
 
         for column in summary_table.colnames:

ccdproc/log_meta.py

@@ -12,6 +12,7 @@
 
 import ccdproc  # Really only need Keyword from ccdproc
 
+
 __all__ = []
 
 _LOG_ARGUMENT = 'add_keyword'