frappy/get_all_param: catch error when object is missing

tcl/startup/frappy.tcl

@@ -266,10 +266,13 @@ proc frappy_async_client {} {
 
 proc get_all_param {args} {
   foreach obj $args {
+    catch {
       set hp [get_obj_path $obj]
       hnotify $hp 1
       get_param_values $hp
     }
+    # todo: create error message on failure
+  }
 }
 
 proc error_update_script {hp} {