From 6637d499e773ada6d0f9707227b5622ff07b2d32 Mon Sep 17 00:00:00 2001
From: mcara <mcara@stsci.edu>
Date: Wed, 4 Jun 2014 04:42:25 +0000
Subject: deleteWCS crashes when called on compressed FITS HDU (CompImageHDU)
 because of a bug in CompImageHDU that does not allow `del` on non-existent
 header keywords.

For more details see https://github.com/astropy/astropy/issues/2594


git-svn-id: http://svn.stsci.edu/svn/ssb/stsci_python/stwcs/trunk@32334 fe389314-cf27-0410-b35b-8c050e845b92
---
 lib/stwcs/wcsutil/altwcs.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'lib/stwcs/wcsutil')

diff --git a/lib/stwcs/wcsutil/altwcs.py b/lib/stwcs/wcsutil/altwcs.py
index befa2bb..bdb9b3b 100644
--- a/lib/stwcs/wcsutil/altwcs.py
+++ b/lib/stwcs/wcsutil/altwcs.py
@@ -350,7 +350,8 @@ def deleteWCS(fname, ext, wcskey=" ", wcsname=" "):
         if hwcs is None:
             continue
         for k in hwcs.keys():
-            del hdr[k]
+            if k in hdr:
+                del hdr[k]
             #del hdr['ORIENT'+wkey]
         prexts.append(i)
     if prexts != []:
-- 
cgit