Do not clone model requests on server if possible (#6353)

plugins/tracker-resources/src/components/CreateIssue.svelte

@@ -352,10 +352,14 @@
     attr: client.getHierarchy().getAttribute(tracker.class.Issue, 'labels')
   }
 
-  $: spaceQuery.query(tracker.class.Project, { _id: _space }, (res) => {
-    resetDefaultAssigneeId()
-    currentProject = res[0]
-  })
+  $: if (_space !== undefined) {
+    spaceQuery.query(tracker.class.Project, { _id: _space }, (res) => {
+      resetDefaultAssigneeId()
+      currentProject = res[0]
+    })
+  } else {
+    currentProject = undefined
+  }
 
   const docCreateManager = DocCreateExtensionManager.create(tracker.class.Issue)
 
@@ -758,7 +762,7 @@
       label={tracker.string.Project}
       bind:space={_space}
       on:object={(evt) => {
-        currentProject = evt.detail
+        currentProject = evt.detail ?? undefined
       }}
       kind={'regular'}
       size={'small'}