pyln: don't reap a bitcoind that was never started

Author: kwsantiago

contrib/pyln-testing/pyln/testing/utils.py

@@ -627,6 +627,11 @@ def set_port(self, rpcport):
         self.port_setup = True
 
     def kill(self):
+        # Never started: parametrize('bitcoind', [False], indirect=True).
+        if self.proc is None:
+            self.cleanup_files()
+            return
+
         try:
             self.stop()
         except Exception: