GUAC-932: null connection group identifier does NOT mean root. This is implementation-dependent.

guacamole/src/main/java/org/glyptodon/guacamole/net/basic/rest/connectiongroup/APIConnectionGroup.java

@@ -89,10 +89,6 @@ public class APIConnectionGroup {
         this.identifier = connectionGroup.getIdentifier();
         this.parentIdentifier = connectionGroup.getParentIdentifier();
 
-        // Use the explicit ROOT group ID
-        if (this.parentIdentifier == null)
-            this.parentIdentifier = ROOT_IDENTIFIER;
-        
         this.name = connectionGroup.getName();
         this.type = connectionGroup.getType();