Fix Exception Try/Catch

[FreedomLabsIO]

Fix for Exception not being caught when "local.properties" file doesn't exist.

Starting Analysis: 2019-01-07 11:08:58.043
Exception in thread "main" java.lang.NullPointerException
	at java.util.Properties$LineReader.readLine(Unknown Source)
	at java.util.Properties.load0(Unknown Source)
	at java.util.Properties.load(Unknown Source)
	at explorer.engine.MainEngine.<init>(MainEngine.java:37)
	at explorer.engine.MainEngine.main(MainEngine.java:106)