ipacm: Fix to not filter_notify request

Make changes to not to send filter_notify request with
0 rules when there are no filter rules installed.

Change-Id: I9306066a3383340057bdb08c913fcc3c8a7264c7

ipacm/src/IPACM_Lan.cpp

diff --git a/ipacm/src/IPACM_Lan.cpp b/ipacm/src/IPACM_Lan.cpp
index 2f18f38..e47767c 100644
--- a/ipacm/src/IPACM_Lan.cpp
+++ b/ipacm/src/IPACM_Lan.cpp
@@ -1124,6 +1124,12 @@
 			close(fd);
 			return IPACM_FAILURE;
 		}
+		if (num_wan_ul_fl_rule_v4 == 0)
+		{
+			IPACMERR("No modem UL rules were installed, return...\n");
+			close(fd);
+			return IPACM_FAILURE;
+		}
 		if (m_filtering.DeleteFilteringHdls(wan_ul_fl_rule_hdl_v4,
 			IPA_IP_v4, num_wan_ul_fl_rule_v4) == false)
 		{