Set RequestProtector replacement optional again

bubble-server/src/main/java/bubble/app/request/RequestProtectorAppConfigDriver.java

@@ -69,11 +69,8 @@ public class RequestProtectorAppConfigDriver extends AppConfigDriverBase {
         if (empty(regex)) throw invalidEx("err.requestProtector.headerRegexRequired");
 
         final JsonNode replacementNode = data.get(PARAM_REPLACEMENT);
-        if (replacementNode == null || replacementNode.textValue() == null) {
-            throw invalidEx("err.requestProtector.headerReplacementRequired");
-        }
-        final String replacement = replacementNode.textValue().trim();
-        if (empty(replacement)) throw invalidEx("err.requestProtector.headerReplacementRequired");
+        final String replacement = (replacementNode == null || replacementNode.textValue() == null)
+                                   ? "" : replacementNode.textValue().trim();
 
         final RequestProtectorConfig config = getConfig(account, app).addHeaderReplacement(regex, replacement);
 

bubble-server/src/main/resources/models/apps/request/bubbleApp_request.json

@@ -68,8 +68,7 @@
         { "name": "config.action.addHeaderReplacement", "value": "Add" },
         { "name": "config.action.removeHeaderReplacement", "value": "Remove" },
 
-        { "name": "err.requestProtector.headerRegexRequired", "value": "RegEx field is required" },
-        { "name": "err.requestProtector.headerReplacementRequired", "value": "Replacement field is required" }
+        { "name": "err.requestProtector.headerRegexRequired", "value": "RegEx field is required" }
       ]
     }]
   }