Propagate package discovery failures before removal

bin/omarchy-pkg-drop

@@ -8,9 +8,16 @@ installed=()
 declare -A installed_exact=()
 declare -A selected=()
 
+if ! installed_packages=$(pacman -Qq); then
+  echo "Unable to query installed packages; no packages were removed." >&2
+  exit 1
+fi
+
 while IFS= read -r package_name; do
-  installed_exact[$package_name]=1
-done < <(pacman -Qq)
+  if [[ -n $package_name ]]; then
+    installed_exact[$package_name]=1
+  fi
+done <<< "$installed_packages"
 
 for pkg in "$@"; do
   if [[ -n ${installed_exact[$pkg]} && -z ${selected[$pkg]} ]]; then