metadata: monkeypatch Undefined to show as empty string (#108)

* monkeypatch Undefined to show as empty string
spacetelescope · Apr 19, 2024 · a4a822d · a4a822d
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diff --git a/CHANGES.rst b/CHANGES.rst
@@ -2,6 +2,7 @@
 ------------------
 
 * Support loading, viewing, and slicing through TPF data cubes. [#82]
+* Metdata plugin: show undefined entries as empty string instead of object repr. [#108]
 
 0.3.0 - (04-05-2024)
 --------------------

diff --git a/lcviz/plugins/metadata_viewer/metadata_viewer.py b/lcviz/plugins/metadata_viewer/metadata_viewer.py
@@ -1,9 +1,16 @@
+from astropy.io.fits.card import Undefined
+
 from jdaviz.configs.default.plugins import MetadataViewer
 from jdaviz.core.registries import tray_registry
 
 __all__ = ['MetadataViewer']
 
 
+# monkeypatch astropy.io.fits.card.Undefined to show an empty string
+# instead of '<astropy.io.fits.card.Undefined object at 0x29f5b94d0>'
+Undefined.__str__ = lambda x: ''
+
+
 @tray_registry('lcviz-metadata-viewer', label="Metadata")
 class MetadataViewer(MetadataViewer):
     """
-Original file line number
+Diff line change
@@ Expand Up / @@ -2,6 +2,7 @@ @@
     ------------------
     * Support loading, viewing, and slicing through TPF data cubes. [#82]
+    * Metdata plugin: show undefined entries as empty string instead of object repr. [#108]
 .3.0 - (04-05-2024)
     --------------------
@@ Expand Down @@