Change a misleading operator usage in DataCenterNameTree.

src/formats/Data/Serialization/DataCenterNameTree.cs

@@ -29,7 +29,7 @@ void ConstructTree(DataCenterNode dataNode, DataCenterNameNode nameNode)
             var keys = dataNode.Keys;
 
             // There can be keys that refer to attributes that do not exist even in the official data center, so we need
-            // to explicitly add these attribute names.
+            // to explicitly add these attribute names first.
             if (keys.HasAttributeNames)
                 foreach (var name in keys.AttributeNames)
                     nameNode.Attributes[name] = true;
@@ -42,7 +42,7 @@ void ConstructTree(DataCenterNode dataNode, DataCenterNameNode nameNode)
                         nameNode.Attributes, name, out var exists);
 
                     if (!exists)
-                        isKey |= false;
+                        isKey = false;
                 }
             }