fix /productindex/aggProductList

@@ -157,6 +157,9 @@ public class SearchServiceHelper {
 		if (!paramMap.containsKey(paramName) || StringUtils.isBlank(paramMap.get(paramName))) {
 			return false;
 		}
+		if(paramMap.get(paramName).equals("null")){
+			return false;
+		}
 		if (StringUtils.isNotBlank(filterParamName) && paramName.equals(filterParamName)) {
 			return false;
 		}

@@ -100,9 +100,9 @@ public class AggProductListServiceImpl implements IAggProductListService, Applic
 	private int getTopHitsBucketSize(Map<String, String> paramMap) {
 		try {
 			int count = Integer.parseInt(paramMap.get("aggTypeSize"));
-			return count <= 0 ? 0 : count;
+			return count <= 0 ? 1 : count;
 		} catch (Exception e) {
-			return 0;
+			return 1;
 		}
 	}