bachefs-tools: Fix broken test code.

A check was missing in some of the python test code, probably from a bad
cherry-pick.

Signed-off-by: Justin Husted <sigstop@gmail.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/tests/util.py b/tests/util.py
index a9e97464..c96f2eeb 100644
--- a/tests/util.py
+++ b/tests/util.py
@@ -210,10 +210,11 @@ class BFuse:
         run("fusermount3", "-zu", self.mnt)
         print("Waiting for thread to exit.")
 
-        self.thread.join(timeout)
-        if self.thread.is_alive():
-            self.proc.kill()
-            self.thread.join()
+        if self.thread:
+            self.thread.join(timeout)
+            if self.thread.is_alive():
+                self.proc.kill()
+                self.thread.join()
 
         self.thread = None
         self.ready.clear()