fix CDIPS parsing support (column filled with strings) (#122)

* fix units with empty strings

affects CDIPS HLSP light curves

* changelog entry

* more robust handling that still accepts unitless empty string

Author: kecnry

CHANGES.rst

@@ -6,6 +6,8 @@
 0.4.1 (unreleased)
 ------------------
 
+* Fixes CDIPS support by handling columns filled with strings with empty units. [#122]
+
 0.4.0 (06-11-2024)
 ------------------
 

lcviz/utils.py

@@ -282,7 +282,13 @@ def to_object(self, data_or_subset):
             if len(values) and isinstance(values[0], Time):
                 values = Time(values.base)
             elif hasattr(component, 'units') and component.units != "None":
-                values = u.Quantity(values, component.units)
+                try:
+                    values = u.Quantity(values, component.units)
+                except TypeError:
+                    if component.units != "":
+                        raise
+                    # values could have been an array of strings with units ""
+                    values = values
 
             if component_id.label not in names:
                 columns.append(values)