fixing bugs:

1. error formatting caused error on OIDC login
2. sending credentials to OIDC provider

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

core/src/main/java/de/srsoftware/umbrella/core/exceptions/UmbrellaException.java

@@ -19,7 +19,7 @@ public class UmbrellaException extends RuntimeException{
 	}
 
 	public UmbrellaException(int statusCode, String message, Object ... fills){
-		super(format(message,fills));
+		super(fills == null || fills.length<1 ? message : format(message,fills));
 		this.statusCode = statusCode;
 	}