Check if matrix is installed

src/freedombone-app-matrix

@@ -314,6 +314,12 @@ function reconfigure_matrix {
 }
 
 function upgrade_matrix {
+    if [ ! -d /etc/sydent ]; then
+       return
+    fi
+    if [ ! -d /etc/matrix ]; then
+       return
+    fi
     systemctl stop turn
     systemctl stop matrix
     systemctl stop sydent