fix: get_dag时matin matout为空时不报错

apps/mtm/models.py

@@ -485,14 +485,15 @@ class Route(CommonADModel):
         edges = []
 
         for rq in rqs:
-            source = rq.material_in.id
-            target = rq.material_out.id
-            nodes_set.update([source, target])
-            edges.append({
-                'source': source,
-                'target': target,
-                'label': rq.process.name, 
-            })
+            if rq.material_in and rq.material_out:
+                source = rq.material_in.id
+                target = rq.material_out.id
+                nodes_set.update([source, target])
+                edges.append({
+                    'source': source,
+                    'target': target,
+                    'label': rq.process.name, 
+                })
         # 将批次号排序
         nodes_qs = Material.objects.filter(id__in=nodes_set).order_by("process__sort", "create_time")