Must call rpath.isincfile() before rpath.isinccompressed() works

git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@816 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

trunk/rdiff-backup/CHANGELOG

 New in v1.1.12 (????/??/??)
 ---------------------------
 
+Finally solve AttributeError due to no 'inc_compressed' attribute
+that occured during some regress operations. (Andrew Ferguson)
+
 Squash bug where --check-destination-dir or regress operation failed
 after crash when --force option was not used. RPath's are now
 properly pickled. (Andrew Ferguson)

trunk/rdiff-backup/rdiff_backup/metadata.py

@@ -379,6 +379,7 @@ class FlatFile:
 			self.fileobj = self.rp.open("rb", compress)
 		else:
 			assert mode == 'w'
+			if not check_path: rp_base.isincfile()
 			if compress and not rp_base.isinccompressed():
 				def callback(rp): self.rp = rp
 				self.fileobj = rpath.MaybeGzip(rp_base, callback)