If we don't have a GNS3 VM on linux don't move file to it

gns3server/controller/__init__.py

@@ -244,6 +244,12 @@ class Controller:
                 raise aiohttp.web.HTTPNotFound(text="You try to use a node on the GNS3 VM server but the GNS3 is not configured")
             raise aiohttp.web.HTTPNotFound(text="Compute ID {} doesn't exist".format(compute_id))
 
+    def has_compute(self, compute_id):
+        """
+        Return True if the compute exist in the controller
+        """
+        return compute_id in self._computes
+
     @asyncio.coroutine
     def add_project(self, project_id=None, name=None, **kwargs):
         """

gns3server/controller/import_project.py

@@ -74,8 +74,9 @@ def import_project(controller, project_id, stream, location=None, name=None, kee
 
         # Modify the compute id of the node depending of compute capacity
         if not keep_compute_id:
-            # For some VM type we move them to the GNS3 VM if it's not a Linux host
-            if not sys.platform.startswith("linux"):
+            # For some VM type we move them to the GNS3 VM if possible
+            # unless it's a linux host without GNS3 VM
+            if not sys.platform.startswith("linux") or controller.has_compute("vm"):
                 for node in topology["topology"]["nodes"]:
                     if node["node_type"] in ("docker", "qemu", "iou"):
                         node["compute_id"] = "vm"