client_software cosmetic changes

client_software/0110_nextcloud_talk_app/install.sh

@@ -7,7 +7,13 @@
 
 #Check for root
 if [ "$EUID" -ne 0 ]; then
-    echo "Error: Script requires root. Please check if ${SCRIPTPATH}/${SCRIPTNAME} is in sudoers rules and if you are a member. And if executed via sudo."
+    echo "Error: Script requires root."
+    exit 1
+fi
+
+#Check Token
+if [ "${DAVTOKEN_USER}." == "." ]; then
+    echo "Error: Script cannot be executed standalone and needs a prereserved environment from sync_client_software.sh. Quit."
     exit 1
 fi