use fallback version string "unknown" if no version string is found in resources (e.g. when not running from .jar file but from .class files in IDE)

Author: scalatron

Scalatron/src/scalatron/Version.scala

@@ -5,5 +5,9 @@ package scalatron
 
 object Version
 {
-    val VersionString = Version.getClass.getPackage.getImplementationVersion
+    val VersionString = {
+        // if we are not running from a .jar file (e.g. in debugger from .class files), the resource query may return 'null'
+        val versionFromResource = Version.getClass.getPackage.getImplementationVersion
+        if(versionFromResource == null) "unknown" else versionFromResource
+    }
 }