Fixed potential NPE from Cursor.getCapabilities()

src/java/org/lwjgl/input/Cursor.java

@@ -141,7 +141,10 @@ public class Cursor {
 	 * @return A bit mask with native cursor capabilities.
 	 */
 	public static int getCapabilities() {
-		return Mouse.getImplementation().getNativeCursorCapabilities();
+		if (Mouse.getImplementation() != null)
+			return Mouse.getImplementation().getNativeCursorCapabilities();
+		else
+			return Mouse.createImplementation().getNativeCursorCapabilities();
 	}
 
 	/**

src/java/org/lwjgl/input/Keyboard.java

@@ -307,6 +307,8 @@ public class Keyboard {
 	 * @throws LWJGLException if the keyboard could not be created for any reason
 	 */
 	public static void create() throws LWJGLException {
+		if (!Display.isCreated()) throw new IllegalStateException("Display must be created.");
+
 		create(Mouse.createImplementation());
 	}
 

src/java/org/lwjgl/input/Mouse.java

@@ -225,8 +225,6 @@ public class Mouse {
 	}
 
 	static InputImplementation createImplementation() {
-		if (!Display.isCreated()) throw new IllegalStateException("Display must be created.");
-
 		/* Use reflection since we can't make Display.getImplementation
 		 * public
 		 */
@@ -278,6 +276,8 @@ public class Mouse {
 	 * @throws LWJGLException if the mouse could not be created for any reason
 	 */
 	public static void create() throws LWJGLException {
+		if (!Display.isCreated()) throw new IllegalStateException("Display must be created.");
+
 		create(createImplementation());
 	}