Add message for invalid regexpr

Author: VladislavKostyukevich

src/main/java/main/exceptions/AqualitySQLException.java

@@ -15,6 +15,8 @@ private static String getErrorMessage(String sqlcode){
             case "45000":
             case "23505":
                 return "You are trying to create duplicate entity.";
+            case "42000":
+                return "You Regular expression is not valid!";
             default:
                 return String.format("Unknown SQL Error: %s", sqlcode);
         }
@@ -26,6 +28,8 @@ private static Integer getErrorCode(String sqlcode){
             case "45000":
             case "23505":
                 return 409;
+            case "42000":
+                return 400;
             default:
                 return 500;
         }