Added Null check for artwork

Author: Julian Kast

base/src/main/java/com/smartdevicelink/managers/screen/choiceset/ChoiceCell.java

@@ -224,7 +224,7 @@ public int hashCode() {
         result += ((getText() == null) ? 0 : Integer.rotateLeft(getText().hashCode(), 1));
         result += ((getSecondaryText() == null) ? 0 : Integer.rotateLeft(getSecondaryText().hashCode(), 2));
         result += ((getTertiaryText() == null) ? 0 : Integer.rotateLeft(getTertiaryText().hashCode(), 3));
-        result += Integer.rotateLeft(getArtwork().hashCode(), 4);
+        result += ((getArtwork() == null) ? 0 : Integer.rotateLeft(getArtwork().hashCode(), 4));
         result += ((getSecondaryArtwork() == null || getSecondaryArtwork().getName() == null) ? 0 : Integer.rotateLeft(getSecondaryArtwork().getName().hashCode(), 5));
         result += ((getVoiceCommands() == null) ? 0 : Integer.rotateLeft(getVoiceCommands().hashCode(), 6));
         return result;

base/src/main/java/com/smartdevicelink/managers/screen/menu/MenuCell.java

@@ -299,7 +299,7 @@ int getParentCellId() {
 	public int hashCode() {
 		int result = 1;
 		result += ((getTitle() == null) ? 0 : Integer.rotateLeft(getTitle().hashCode(), 1));
-		result += Integer.rotateLeft(getIcon().hashCode(), 2);
+		result += ((getIcon() == null) ? 0 : Integer.rotateLeft(getIcon().hashCode(), 2));
 		result += ((getVoiceCommands() == null) ? 0 : Integer.rotateLeft(getVoiceCommands().hashCode(), 3));
 		result += ((getSubCells() == null) ? 0 : Integer.rotateLeft(1, 4));
 		return result;