[widgets][toolchaineditor] Make resistent to bad json

beat/editor/widgets/toolchaineditor.py

@@ -748,21 +748,14 @@ class Toolchain(QWidget):
 
         self.json_object = json_object
 
-        if "representation" in self.json_object:
-            self.web_representation = self.json_object["representation"]
-        else:
-            self.web_representation = None
-
-        if "editor_gui" in self.json_object:
-            self.editor_gui = self.json_object["editor_gui"]
-        else:
-            self.editor_gui = None
+        self.web_representation = self.json_object.get("representation")
+        self.editor_gui = self.json_object.get("editor_gui")
 
         self.clear_space()
 
         # Get datasets, blocks, analyzers
         for block_type in BlockType:
-            for block_item in self.json_object[block_type.value]:
+            for block_item in self.json_object.get(block_type.value, {}):
                 block = Block(
                     block_type.name, self.block_config, self.connection_config
                 )
@@ -780,8 +773,10 @@ class Toolchain(QWidget):
                 self.scene.addItem(block)
 
         # Display connections
-        connections = self.json_object["connections"]
-        channel_colors = self.json_object["representation"]["channel_colors"]
+        connections = self.json_object.get("connections", [])
+        channel_colors = self.json_object.get("representation", {}).get(
+            "channel_colors"
+        )
 
         for connection_item in connections:
             connection = Connection(self.connection_config)