make sure empty dict is allowed

Author: tomvanmele

compas-FoFin.rhproj

@@ -8,7 +8,7 @@
   "id": "5df3b821-822e-49e0-b24e-aebbe671c3d1",
   "identity": {
     "name": "COMPAS-FormFinder",
-    "version": "0.2.75-beta",
+    "version": "0.3.2",
     "publisher": {
       "email": "[email protected]",
       "name": "Tom Van Mele",
@@ -30,13 +30,23 @@
           "width": 24,
           "height": 24
         },
+        "dark": {
+          "bytes": "iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAYAAADgdz34AAAAAXNSR0IArs4c6QAAAERlWElmTU0AKgAAAAgAAYdpAAQAAAABAAAAGgAAAAAAA6ABAAMAAAABAAEAAKACAAQAAAABAAAAGKADAAQAAAABAAAAGAAAAADiNXWtAAAAIUlEQVRIDe3QAQ0AAADCoPdP7ewBESgMGDBgwIABAwY\u002BMAkYAAGvX7w8AAAAAElFTkSuQmCC",
+          "width": 24,
+          "height": 24
+        },
         "icoData": "AAABAAEAGBgAAAEAIAC6AAAAFgAAAIlQTkcNChoKAAAADUlIRFIAAAAYAAAAGAgGAAAA4Hc9\u002BAAAAARnQU1BAANbXlz/JngAAABEZVhJZk1NACoAAAAIAAGHaQAEAAAAAQAAABoAAAAAAAOgAQADAAAAAQABAACgAgAEAAAAAQAAABigAwAEAAAAAQAAABgAAAAA4jV1rQAAACFJREFUSA3t0AENAAAAwqD3T\u002B3sAREoDBgwYMCAAQMGPjAJGAABr1\u002B8PAAAAABJRU5ErkJggg=="
       },
       "categoryIcon": {
         "light": {
           "bytes": "iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAERlWElmTU0AKgAAAAgAAYdpAAQAAAABAAAAGgAAAAAAA6ABAAMAAAABAAEAAKACAAQAAAABAAAAEKADAAQAAAABAAAAEAAAAAA0VXHyAAAAFUlEQVQ4EWNgGAWjITAaAqMhAAkBAAQQAAG\u002BY1MiAAAAAElFTkSuQmCC",
           "width": 16,
           "height": 16
+        },
+        "dark": {
+          "bytes": "iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAERlWElmTU0AKgAAAAgAAYdpAAQAAAABAAAAGgAAAAAAA6ABAAMAAAABAAEAAKACAAQAAAABAAAAEKADAAQAAAABAAAAEAAAAAA0VXHyAAAAFUlEQVQ4EWNgGAWjITAaAqMhAAkBAAQQAAG\u002BY1MiAAAAAElFTkSuQmCC",
+          "width": 16,
+          "height": 16
         }
       }
     }
@@ -543,7 +553,6 @@
       }
     }
   ],
-  "libraries": [],
   "resources": [
     {
       "id": "848a81fd-55b8-4535-ada4-fcaeda84366b",

src/compas_fofin/datastructures/cablemesh.py

@@ -17,7 +17,7 @@ def __data__(self) -> dict:
     @classmethod
     def __from_data__(cls, data: dict) -> "CableMesh":
         cablemesh = super(CableMesh, cls).__from_data__(data)
-        cablemesh.constraints = data["constraints"]
+        cablemesh.constraints = data.get("constraints") or {}
         return cablemesh
 
     def __init__(self, constraints: Optional[list[Constraint]] = None, **kwargs) -> None: