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[PATCHv3 05/20] diff.c: emit_line_0 can handle no color setting

In later patches we may pass lines that are not colored to the central
function emit_line_0, so we need to emit the color only when it is

We could have chosen to pass "" instead of NULL, but that would be more

Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
 diff.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/diff.c b/diff.c
index 73e55b0c10..6c1886d495 100644
--- a/diff.c
+++ b/diff.c
@@ -532,11 +532,13 @@ static void emit_line_0(struct diff_options *o, const char *set, const char *res
 	if (len || sign) {
-		fputs(set, file);
+		if (set)
+			fputs(set, file);
 		if (sign)
 			fputc(sign, file);
 		fwrite(line, len, 1, file);
-		fputs(reset, file);
+		if (reset)
+			fputs(reset, file);
 	if (has_trailing_carriage_return)
 		fputc('\r', file);