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-rw-r--r--lib/stwcs/wcsutil/hstwcs.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/stwcs/wcsutil/hstwcs.py b/lib/stwcs/wcsutil/hstwcs.py
index 1e0e23d..5aab087 100644
--- a/lib/stwcs/wcsutil/hstwcs.py
+++ b/lib/stwcs/wcsutil/hstwcs.py
@@ -343,7 +343,8 @@ class HSTWCS(WCS):
val = self.__getattribute__(c)
except AttributeError:
continue
- cards.append(pyfits.Card(key=c, value=val))
+ if val:
+ cards.append(pyfits.Card(key=c, value=val))
return cards
def pc2cd(self):