fix for issue #592

Author: plamen5kov

test-app/app/src/main/java/com/tns/Util.java

@@ -114,6 +114,10 @@ private static void silentClose(Closeable closeable)
 
 	public static Boolean isPositive(String value)
 	{
+		if(value == null) {
+			return false;
+		}
+
 		return (value.equals("true") || value.equals("TRUE") ||
 				value.equals("yes") || value.equals("YES") ||
 				value.equals("enabled") || value.equals("ENABLED"));