avoid crashing when there are remotes using unparseable urls

Including the non-standard URI form that git-remote-gcrypt uses for rsync.

Eg, "ook://foo:bar" cannot be parsed because "bar" is not a valid port
number. But git could have a remote with that, it would try to run
git-remote-ook to handle it. So, git-annex has to allow for such things,
rather than crashing.

This commit was sponsored by Luke Shumaker on Patreon.

Git/Types.hs

@@ -34,6 +34,7 @@ data RepoLocation
 	= Local { gitdir :: RawFilePath, worktree :: Maybe RawFilePath }
 	| LocalUnknown RawFilePath
 	| Url URI
+	| UnparseableUrl String
 	| Unknown
 	deriving (Show, Eq, Ord)