Fix "Reload Libraries macro issues"

klayout_package/python/kqcircuits/util/layout_to_code.py

@@ -358,7 +358,7 @@ def get_node_params(node: Node):
 
 
 def extract_pcell_data_from_views():
-    """Remove all PCells and return their data.
+    """Remove all KQCircuits PCells and return their data.
 
     Returns: A list of lists. Each element corresponds to a view in KLayout and it is a list of
         ``(type, location, parameters)`` tuples. These tuples completely describe the type, position and
@@ -372,7 +372,7 @@ def extract_pcell_data_from_views():
         pcells = []
         for inst in top_cell.each_inst():
             pc = inst.pcell_declaration()
-            if pc:
+            if isinstance(pc, Element):
                 params = inst.pcell_parameters_by_name()
                 def_params = pc.__class__.get_schema()
                 for k, v in def_params.items():

klayout_package/python/scripts/macros/0system/0reload.lym

@@ -41,7 +41,11 @@ from kqcircuits.util.library_helper import load_libraries
 from kqcircuits.util.layout_to_code import extract_pcell_data_from_views, restore_pcells_to_views
 
 views = extract_pcell_data_from_views()
-load_libraries(flush=True)
-restore_pcells_to_views(views)
+try:
+  load_libraries(flush=True)
+  restore_pcells_to_views(views)
+except:
+  restore_pcells_to_views(views)
+  raise RuntimeError("Failed to reload all KQCircuits libraries, restoring current view.")
 </text>
 </klayout-macro>