Merge branch 'kn/push-empty-fix'

"git push '' HEAD:there" used to hit a BUG(); it has been corrected
to die with "fatal: bad repository ''".

* kn/push-empty-fix:
  builtin/push: call set_refspecs after validating remote

t/t5529-push-errors.sh

@@ -2,6 +2,9 @@
 
 test_description='detect some push errors early (before contacting remote)'
 
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
 TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
@@ -38,6 +41,20 @@ test_expect_success 'detect missing sha1 expressions early' '
 	test_cmp expect rp-ran
 '
 
+# We use an existing local_ref, since it follows a different flow in
+# 'builtin/push.c:set_refspecs()' and we want to test that regression.
+test_expect_success 'detect empty remote with existing local ref' '
+	test_must_fail git push "" main 2> stderr &&
+	grep "fatal: bad repository ${SQ}${SQ}" stderr
+'
+
+# While similar to the previous test, here we want to ensure that
+# even targeted refspecs are handled.
+test_expect_success 'detect empty remote with targeted refspec' '
+	test_must_fail git push "" HEAD:refs/heads/main 2> stderr &&
+	grep "fatal: bad repository ${SQ}${SQ}" stderr
+'
+
 test_expect_success 'detect ambiguous refs early' '
 	git branch foo &&
 	git tag foo &&