fix pass-through case

src/fsim/static.py

@@ -183,6 +183,7 @@ class FaultSet:
     def fault_site_str(circuit: Circuit, tlib: TechLib, fault: int) -> str:
         site = circuit.lines[fault//2]
         if site.driver.kind == '__fork__':
+            if site.reader.kind == '__fork__': return f'{site.driver.name}'  # edge-case: pass-through connection
             return f'{site.reader.name}/{tlib.pin_name(site.reader.kind, site.reader_pin)}'
         elif site.driver.kind == 'input':
             return f'{site.driver.name}'