Tweaked settings to not try to patch missing dev libs.

 - Legacy-Id: 15018

Author: levkowetz

ietf/settings.py

@@ -960,9 +960,11 @@ def skip_unreadable_post(record):
     'patch/fix-patch-no-chdir.patch',
 ]
 if DEBUG:
-    CHECKS_LIBRARY_PATCHES_TO_APPLY += [
-        'patch/add-django-cprofile-filter.patch',
-    ]
+    try:
+        import django_cprofile_middleware # pyflakes:ignore
+        CHECKS_LIBRARY_PATCHES_TO_APPLY += [ 'patch/add-django-cprofile-filter.patch', ]
+    except ImportError:
+        pass
 
 STATS_NAMES_LIMIT = 25