fixed: Mouse::click: given Location should not be null (issue #299)

API/src/main/java/org/sikuli/script/Mouse.java

@@ -3,16 +3,15 @@
  */
 package org.sikuli.script;
 
-import java.awt.*;
-import java.awt.event.InputEvent;
-import java.awt.event.KeyEvent;
-import java.util.Random;
-
 import org.sikuli.basics.Debug;
 import org.sikuli.basics.Settings;
 import org.sikuli.script.support.*;
 import org.sikuli.util.Highlight;
 
+import java.awt.event.InputEvent;
+import java.awt.event.KeyEvent;
+import java.util.Random;
+
 /**
  * Main pupose is to coordinate the mouse usage among threads <br>
  * At any one time, the mouse has one owner (usually a Region object) <br>
@@ -183,12 +182,15 @@ public static boolean hasMoved() {
    *
    * wait before and after: &gt; 9 taken as milli secs - 1 ... 9 are seconds
    *
-   * @param loc where to click
+   * @param loc where to click (not null)
    * @param action L,R,M left, right, middle - D means double click
    * @param args timing parameters
    * @return the location
    */
   public static Location click(Location loc, String action, Integer... args) {
+    if (null == loc) {
+      throw new IllegalArgumentException("Mouse: click: Location should not be null");
+    }
     if (get().device.isSuspended() || loc.isOtherScreen()) {
       return null;
     }