#11 add image is null check

Author: hleb-albau

client/src/main/java/com/regula/documentreader/webclient/model/ext/ProcessRequestImage.java

@@ -1,5 +1,6 @@
 package com.regula.documentreader.webclient.model.ext;
 
+import com.regula.documentreader.webclient.ApiException;
 import com.regula.documentreader.webclient.model.ImageData;
 
 public class ProcessRequestImage
@@ -8,6 +9,9 @@ public class ProcessRequestImage
   public ProcessRequestImage() {}
 
   public ProcessRequestImage(byte[] image) {
+    if (image == null) {
+      throw new ApiException("No image provided");
+    }
     this.setImageData(new ImageData().withImage(image));
   }