Config: Add PHOTOPRISM_HTTP_CORS option for CDN users #3931 #3940

In addition, the Access-Control-Allow-Origin header is set to the same
URL if an Origin header is found in the request (experimental).

Signed-off-by: Michael Mayer <michael@photoprism.app>

pkg/clean/ascii.go

@@ -2,6 +2,10 @@ package clean
 
 // ASCII removes all non-ascii characters from a string and returns it.
 func ASCII(s string) string {
+	if s == "" {
+		return ""
+	}
+
 	result := make([]rune, 0, len(s))
 
 	for _, r := range s {