Fixed crash when working with ImageMessages

Author: Louuke

build/classes/java/main/icu/jnet/whatsjava/Main$1.class

@@ -35,7 +35,7 @@ public static byte[] decrypt(byte[] mediaKey, String url, String mediaType) {
 
 		// Download encrypted media
 		byte[] encryptedMedia = Utils.urlToEncryptedMedia(url);
-		
+
 		if(encryptedMedia != null) {
 			byte[] file = Arrays.copyOfRange(encryptedMedia, 0, encryptedMedia.length - 10);
 			byte[] mac = Arrays.copyOfRange(encryptedMedia, encryptedMedia.length - 10, encryptedMedia.length);
@@ -45,7 +45,7 @@ public static byte[] decrypt(byte[] mediaKey, String url, String mediaType) {
 
 			// Validate macKey of mediaKeyExpanded with mac key of the encrypted media
 			byte[] hmacSign = Utils.signHMAC(macKey, message);
-			
+
 			// Media validated
 			if(Arrays.equals(mac, Arrays.copyOfRange(hmacSign, 0, 10))) {
 				return AES.decrypt(file, cipherKey, iv);

build/classes/java/main/icu/jnet/whatsjava/Main.class

@@ -34,7 +34,7 @@ public static Object[] jsonToObjects(String json) {
 					String typeValue = attributes.get("type").getAsString();
 
 					// Contains node content
-					JsonArray childrenArray = node.get(2).isJsonArray() ? node.get(2).getAsJsonArray() : null;
+					JsonArray childrenArray = node.get(2).isJsonArray() ? node.get(2).getAsJsonArray() : new JsonArray();
 
 					switch (typeValue) {
 						case "message":

src/main/java/icu/jnet/whatsjava/encryption/MediaEncryption.java

@@ -33,7 +33,8 @@ public WAImageMessage(WebMessageInfo message) {
 
 		// Convert byte array to BufferedImage and load full resolution image
 		this.jpegThumbnail = MediaEncryption.convertBytesToImage(imageMessage.getJpegThumbnail().toByteArray());
-		this.jpegFullResolution = MediaEncryption.convertBytesToImage(MediaEncryption.decrypt(mediaKey, url, MediaEncryption.MEDIA_TYPE_IMAGE));
+		byte[] decryptedBytes = MediaEncryption.decrypt(mediaKey, url, MediaEncryption.MEDIA_TYPE_IMAGE);
+		this.jpegFullResolution = decryptedBytes != null ? MediaEncryption.convertBytesToImage(decryptedBytes) : jpegThumbnail;
 	}
 
 	public String getMimetype() {