Added service exists or not check

src/lib/ee_lib_service.sh

@@ -7,6 +7,8 @@
 function ee_lib_service()
 {
 	for ee_service_name in ${@:1:$(($#-1))}; do
+		dpkg --get-selections | grep -v deinstall | grep $ee_service_name &>> $EE_COMMAND_LOG
+		if [ $? -eq 0 ];then
 			# Display message
 			ee_lib_echo "Executing service $ee_service_name ${@: -1}, please wait..."
 
@@ -38,5 +40,6 @@ function ee_lib_service()
 				service $ee_service_name ${@: -1} &>> $EE_COMMAND_LOG \
 				|| ee_lib_error "Unable to execute service $ee_service_name ${@: -1}, exit status = " $?
 			fi
+		fi
 	done
 }