default category fix when ther is not any default category

app/src/main/java/ch/pizzalemon/android/activity/MainActivity.java

@@ -557,6 +557,17 @@ public class MainActivity extends BaseActivity {
                 break;
             }
         }
+        if(defaultCategory == null){
+            for(CategoryModel categoryModel: categoryList){
+                if(categoryModel.getName().trim().toLowerCase().equals("pizza")){
+                    defaultCategory = categoryModel;
+                    break;
+                }
+            }
+        }
+        if(defaultCategory == null){
+            defaultCategory = categoryList.get(0);
+        }
         return defaultCategory;
     }