Fix empty part-of-day logic (#3726)

Fixes #3727

---------

Co-authored-by: veeck <gitkraken@veeck.de>

tests/configs/modules/compliments/compliments_evening.js

@@ -0,0 +1,22 @@
+let config = {
+	address: "0.0.0.0",
+	ipWhitelist: [],
+	timeFormat: 12,
+
+	modules: [
+		{
+			module: "compliments",
+			position: "middle_center",
+			config: {
+				compliments: {
+					evening: ["Evening here"]
+				}
+			}
+		}
+	]
+};
+
+/*************** DO NOT EDIT THE LINE BELOW ***************/
+if (typeof module !== "undefined") {
+	module.exports = config;
+}