Ensure that ColorPicker does not crash on empty string.

Fix: 117302644
Test: Manual. On the create managed profile screen, click "Select
provisioning parameters", beside "Color" click "SELECT", click
"#ffffffff", empty the text field, click "UPDATE". Expect that it will
not crash.

Change-Id: Id6a290cec83d24c4e8cd0d7f9e4e45f5d78242e2

Author: jscott1989

app/src/main/java/com/afwsamples/testdpc/common/ColorPicker.java

@@ -202,8 +202,15 @@ public interface OnColorSelectListener {
      */
     @Override
     public void onClick(View view) {
+        final String color = mColorValue.getText().toString();
+
+        if (color.isEmpty()) {
+            Toast.makeText(getActivity(), R.string.not_valid_color, Toast.LENGTH_SHORT).show();
+            return;
+        }
+
         try {
-            mCurrentColor = Color.parseColor(mColorValue.getText().toString());
+            mCurrentColor = Color.parseColor(color);
             updateViewsColor();
         } catch (IllegalArgumentException e) {
             Toast.makeText(getActivity(), R.string.not_valid_color, Toast.LENGTH_SHORT).show();