tested real proxmox connection

--> passed

backend/internal/template/handler.go

@@ -28,6 +28,9 @@ func (h Handler) ListTemplates(w http.ResponseWriter, r *http.Request) {
 		writeError(w, http.StatusInternalServerError, "templates_list_failed")
 		return
 	}
+	if templates == nil {
+		templates = []Template{}
+	}
 
 	writeJSON(w, http.StatusOK, map[string][]Template{"data": templates})
 }
@@ -186,4 +189,4 @@ func writeJSON(w http.ResponseWriter, status int, body any) {
 
 func writeError(w http.ResponseWriter, status int, message string) {
 	writeJSON(w, status, map[string]string{"error": message})
-}
+}