If the properties file is missing, it will actually crash with an NPE instead of an IO exception. continue as original intended.
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.jme3.system.AppSettings.<clinit>(AppSettings.java:222)
at com.jme3.app.SimpleApplication.start(SimpleApplication.java:113)
at Test.main(Test.java:12)
Caused by: java.lang.NullPointerException: while trying to invoke the method java.io.Reader.read(char[]) of a null object loaded from field java.util.Properties$LineReader.reader of an object loaded from local variable 'this'
at java.util.Properties$LineReader.readLine(Properties.java:450)
at java.util.Properties.load0(Properties.java:369)
at java.util.Properties.load(Properties.java:357)
at com.jme3.system.JmeVersion.<clinit>(JmeVersion.java:51)
... 3 more