[bug][http] commonConf NullPointerException #1510 (#1511)

Author: kinoxyz1

chunjun-connectors/chunjun-connector-http/src/main/java/com/dtstack/chunjun/connector/http/converter/HttpColumnConverter.java

@@ -55,6 +55,7 @@ public class HttpColumnConverter
 
     public HttpColumnConverter(HttpRestConfig httpRestConfig) {
         this.httpRestConfig = httpRestConfig;
+        this.commonConf = httpRestConfig;
 
         // Only json need to extract the fields
         if (StringUtils.isNotBlank((httpRestConfig.getFields()))) {