scripts/mkimage.sh: fix yaml on re-run

create yaml even if file already exists. This solves the problem of yaml
entry disapearing from latest-release.yaml on a re-run. the yaml is
recreated so we need to recreate every yaml, not only for the images
that are rebuilt.

scripts/mkimage.sh

@@ -217,13 +217,12 @@ build_profile() {
 				echo "$(${_c}sum "$output_file" | cut -d' '  -f1)  ${output_filename}" > "${output_file}.${_c}"
 			done
 		fi
-
-		if [ -n "$_yaml_out" ]; then
-			$mkimage_yaml --release $RELEASE \
-				--title "$title" \
-				--desc "$desc" \
-				"$output_file" >> "$_yaml_out"
-		fi
+	fi
+	if [ -n "$_yaml_out" ]; then
+		$mkimage_yaml --release $RELEASE \
+			--title "$title" \
+			--desc "$desc" \
+			"$output_file" >> "$_yaml_out"
 	fi
 }