Fixed meid nil check

Change-Id: I1feb99e374f92d58bffd374309386287c715c71e
Signed-off-by: Juha Hyttinen <juha.hyttinen@nokia.com>
diff --git a/pkg/xapptweaks/rmrparams.go b/pkg/xapptweaks/rmrparams.go
index 30f42fd..d4e9479 100644
--- a/pkg/xapptweaks/rmrparams.go
+++ b/pkg/xapptweaks/rmrparams.go
@@ -34,6 +34,9 @@
 }
 
 func (meid *RMRMeid) String() string {
+	if meid.RMRMeid == nil {
+		return "meid()"
+	}
 	str := "meid("
 	pad := ""
 	if len(meid.PlmnID) > 0 {