config: Change output of --get-regexp for valueless keys

Print no space after the name of a key without value.
Otherwise keys without values are printed exactly the
same as keys with empty values.

Signed-off-by: Frank Lichtenheld <frank@lichtenheld.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-config.c

@@ -38,8 +38,12 @@ static int show_config(const char* key_, const char* value_)
 			  regexec(regexp, (value_?value_:""), 0, NULL, 0)))
 		return 0;
 
-	if (show_keys)
-		printf("%s ", key_);
+	if (show_keys) {
+		if (value_)
+			printf("%s ", key_);
+		else
+			printf("%s", key_);
+	}
 	if (seen && !do_all)
 		dup_error = 1;
 	if (type == T_INT)

t/t1300-repo-config.sh

@@ -283,6 +283,12 @@ EOF
 test_expect_success 'get variable with no value' \
 	'git-config --get novalue.variable ^$'
 
+echo novalue.variable > expect
+
+test_expect_success 'get-regexp variable with no value' \
+	'git-config --get-regexp novalue > output &&
+	 cmp output expect'
+
 git-config > output 2>&1
 
 test_expect_success 'no arguments, but no crash' \