Empty/null array fixes (#47)

* test: isolate bug #45

* fix: perform empty check on value
closes #45

* tweak: phpdoc updates

Author: Greg Bowler

composer.json

@@ -6,7 +6,7 @@
 	"require": {
 		"php": ">=8.0",
 		"ext-json": "*",
-		"phpgt/typesafegetter": "^1.0"
+		"phpgt/typesafegetter": "^1.3"
 	},
 
 	"require-dev": {