Allow push to init a wiki repo (#1279)

* allow push to init a wiki repo

* compact error check

cmd/serv.go

@@ -296,6 +296,12 @@ func runServ(c *cli.Context) error {
 		gitcmd = exec.Command(verb, repoPath)
 	}
 
+	if isWiki {
+		if err = repo.InitWiki(); err != nil {
+			fail("Internal error", "Failed to init wiki repo: %v", err)
+		}
+	}
+
 	os.Setenv(models.ProtectedBranchRepoID, fmt.Sprintf("%d", repo.ID))
 
 	gitcmd.Dir = setting.RepoRootPath