Fix update script check

flake.lock

@@ -117,11 +117,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1712016346,
-        "narHash": "sha256-O2nO7pD+krq+4HgkLB4VThRtAucIPfXDs/jJqCGlK1w=",
+        "lastModified": 1712212014,
+        "narHash": "sha256-s+lbaf3nLRn1++/X2eXwY9mYCA/m9l8AvyG8beeOaXE=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "4be0464472675212654dedf3e021bd5f1d58b92f",
+        "rev": "7e91f2a0ba4b62b88591279d54f741a13e36245b",
         "type": "github"
       },
       "original": {
@@ -222,11 +222,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1711703276,
-        "narHash": "sha256-iMUFArF0WCatKK6RzfUJknjem0H9m4KgorO/p3Dopkk=",
+        "lastModified": 1712163089,
+        "narHash": "sha256-Um+8kTIrC19vD4/lUCN9/cU9kcOsD1O1m+axJqQPyMM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d8fe5e6c92d0d190646fb9f1056741a229980089",
+        "rev": "fd281bd6b7d3e32ddfa399853946f782553163b5",
         "type": "github"
       },
       "original": {

hosts/common/nixos-upgrade.sh

@@ -42,7 +42,7 @@ nix flake update
 nixos-rebuild build --flake .
 UPDATES=$(nix store diff-closures /run/current-system ./result | awk '/[0-9] →|→ [0-9]/ && !/nixos/' || echo)
 
-if [ $UPDATES ]; then
+if [ "$UPDATES" ]; then
 	echo "NixOS updates to apply: "
 	echo $UPDATES
 	if [ $AUTOACCEPT == false ]; then