fixed bug in system.get_connected_to / get_connected_from

import was missing

src/ifcopenshell-python/ifcopenshell/util/system.py

@@ -17,6 +17,8 @@
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
 
+import ifcopenshell.util
+
 group_types = {
     "IfcZone": ("IfcZone", "IfcSpace", "IfcSpatialZone"),
     "IfcBuiltSystem": (
@@ -82,6 +84,7 @@ def get_connected_port(port):
         return rel.RelatingPort
 
 
+# TODO: cover in tests
 def get_connected_to(element):
     results = []
     for port in ifcopenshell.util.system.get_ports(element):
@@ -96,9 +99,10 @@ def get_connected_to(element):
                     for relConPortToElement in disPort.ContainedIn:
                         if relConPortToElement.RelatedElement != element:
                             results.append(relConPortToElement.RelatedElement)
-    return(results)
+    return results
 
 
+# TODO: cover in tests
 def get_connected_from(element):
     results = []
     for port in ifcopenshell.util.system.get_ports(element):
@@ -113,4 +117,4 @@ def get_connected_from(element):
                     for relConPortToElement in disPort.ContainedIn:
                         if relConPortToElement.RelatedElement != element:
                             results.append(relConPortToElement.RelatedElement)
-    return(results)
+    return results