Fix small things (jMonkeyEngine#1287)

* JmeVersion: Don't throw a NullPointerException when version.properties can't be found.

* ImplHandler: Reduce Code-Duplication by using a multi-catch statement

Author: MeFisto94

jme3-core/src/main/java/com/jme3/asset/ImplHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2012 jMonkeyEngine
+ * Copyright (c) 2009-2020 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -120,16 +120,11 @@ protected T initialValue(){
                     ((AssetLocator)obj).setRootPath(path);
                 }
                 return obj;
-            } catch (InstantiationException ex) {
+            } catch (InstantiationException | IllegalAccessException ex) {
                 logger.log(Level.SEVERE,"Cannot create locator of type {0}, does"
-                            + " the class have an empty and publically accessible"+
+                            + " the class have an empty and publicly accessible"+
                               " constructor?", type.getName());
                 logger.throwing(type.getName(), "<init>", ex);
-            } catch (IllegalAccessException ex) {
-                logger.log(Level.SEVERE,"Cannot create locator of type {0}, "
-                            + "does the class have an empty and publically "
-                            + "accessible constructor?", type.getName());
-                logger.throwing(type.getName(), "<init>", ex);
             }
             return null;
         }

jme3-core/src/main/java/com/jme3/system/JmeVersion.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2015 jMonkeyEngine
+ * Copyright (c) 2009-2020 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -49,7 +49,7 @@ public class JmeVersion {
     static {
         try {
             props.load(JmeVersion.class.getResourceAsStream("version.properties"));
-        } catch (IOException ex) {
+        } catch (IOException | NullPointerException ex) {
             logger.log(Level.WARNING, "Unable to read version info!", ex);
         }
     }