Fix for container regression and added test coverage for that

Regression discussed here: https://www.reddit.com/r/cn1/comments/1ohgzpl/error_with_radchatroom/

Author: shai-almog

CodenameOne/src/com/codename1/ui/Container.java

@@ -4299,8 +4299,6 @@ public MorphAnimation(Container thisContainer, int duration, Motion[][] motions)
             }
             this.thisContainer = thisContainer;
             this.motions = motions;
-            animatedComponents = new Vector();
-            opacity = new Motion[0];
         }
 
         @Override
@@ -4331,7 +4329,7 @@ protected void updateState() {
                     currentCmp.setY(motions[1][iter].getValue());
                     currentCmp.setWidth(motions[2][iter].getValue());
                     currentCmp.setHeight(motions[3][iter].getValue());
-                    if (opacity != null) {
+                    if (opacity != null && iter < opacity.length) {
                         currentCmp.getStyle().setOpacity(opacity[iter].getValue(), false);
                     }
                 }
@@ -4351,7 +4349,7 @@ protected void updateState() {
                     currentCmp.setY(motions[1][iter].getValue());
                     currentCmp.setWidth(motions[2][iter].getValue());
                     currentCmp.setHeight(motions[3][iter].getValue());
-                    if (opacity != null) {
+                    if (opacity != null && iter < opacity.length) {
                         currentCmp.getStyle().setOpacity(opacity[iter].getValue(), false);
                     }
                 }

maven/core-unittests/src/test/java/com/codename1/ui/ContainerTest.java

@@ -30,6 +30,29 @@ void testMorphAnimation() {
         assertEquals(c.getBounds(), a.getBounds());
     }
 
+    @FormTest
+    void testAnimateHierarchyWithDefaultOpacityDoesNotCrash() {
+        Form form = CN.getCurrentForm();
+        form.removeAll();
+        form.setLayout(BoxLayout.y());
+
+        Label first = new Label("First");
+        Label second = new Label("Second");
+        form.addAll(first, second);
+        form.revalidate();
+
+        // Regression guard for commit 4e5cbc2c2092721c8861a34d557fe56fe742e82b where
+        // MorphAnimation's constructor began initializing opacity to an empty array.
+        // When animateHierarchy() is invoked without fade (the default, matching
+        // Form.animateHierarchy and Codename One 7.0.208), MorphAnimation.opacity
+        // remains zero-length yet non-null. The flush() call below mirrors Display.flushEdt()
+        // from the stack trace and would previously trigger an ArrayIndexOutOfBoundsException.
+        assertDoesNotThrow(() -> {
+            form.animateHierarchy(100);
+            form.getAnimationManager().flush();
+        });
+    }
+
     @Test
     void testScrollableFlagsRespectBorderLayout() {
         Container container = new Container(new BorderLayout());