fix: handle case where no crn_url / crn_hash found in allocations

Author: 1yam

src/aleph_client/commands/instance/display.py

@@ -345,10 +345,16 @@ def _prepare_allocation_column(self):
             color_allocation = "magenta3"
             crn_hash = safe_getattr(self.message.content.requirements, "node.node_hash") or ""
         else:
-            crn_url = self.allocation.allocations.node.url
+            # Handle the case where allocations.node might be None
+            node = getattr(self.allocation.allocations, "node", None)
+            if node is not None:
+                crn_url = node.url
+                crn_hash = node.node_id
+            else:
+                crn_url = "N/A"
+                crn_hash = "N/A"
             allocation_str = ALLOCATION_AUTO
             color_allocation = "deep_sky_blue1"
-            crn_hash = self.allocation.allocations.node.node_id
 
         # Assemble the complete allocation column
         self.allocation_column = cast(