Merge pull request #4699 from nelhage/fetch-null-dst

git_refspec_transform: Handle NULL dst

src/refspec.c

@@ -277,7 +277,7 @@ int git_refspec_transform(git_buf *out, const git_refspec *spec, const char *nam
 	}
 
 	if (!spec->pattern)
-		return git_buf_puts(out, spec->dst);
+		return git_buf_puts(out, spec->dst ? spec->dst : "");
 
 	return refspec_transform(out, spec->src, spec->dst, name);
 }

tests/network/refspecs.c

@@ -111,6 +111,11 @@ void test_network_refspecs__transform_mid_star(void)
 	assert_valid_transform("refs/*:refs/*", "refs/heads/master", "refs/heads/master");
 }
 
+void test_network_refspecs__no_dst(void)
+{
+	assert_valid_transform("refs/heads/master:", "refs/heads/master", "");
+}
+
 static void assert_invalid_transform(const char *refspec, const char *name)
 {
 	git_refspec spec;