From b42e7d4138ecca1e51807350f058f2ddcb19af08 Mon Sep 17 00:00:00 2001
From: Henry Pinkard <7969470+henrypinkard@users.noreply.github.com>
Date: Fri, 22 Sep 2023 07:55:23 -0700
Subject: [PATCH] fix headless mode with no config file

---
 pycromanager/_version.py | 2 +-
 pycromanager/headless.py | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/pycromanager/_version.py b/pycromanager/_version.py
index ffb96782..fc883cc8 100644
--- a/pycromanager/_version.py
+++ b/pycromanager/_version.py
@@ -1,2 +1,2 @@
-version_info = (0, 29, 4)
+version_info = (0, 29, 5)
 __version__ = ".".join(map(str, version_info))
diff --git a/pycromanager/headless.py b/pycromanager/headless.py
index 771a39e9..2601f9fb 100644
--- a/pycromanager/headless.py
+++ b/pycromanager/headless.py
@@ -119,7 +119,7 @@ def stop_headless(debug=False):
 atexit.register(stop_headless)
 
 def start_headless(
-    mm_app_path: str, config_file: str='', java_loc: str=None,
+    mm_app_path: str, config_file: str=None, java_loc: str=None,
         python_backend=False, core_log_path: str='',
         buffer_size_mb: int=1024, max_memory_mb: int=2000,
         port: int=_Bridge.DEFAULT_PORT, debug=False):
@@ -185,7 +185,7 @@ def start_headless(
                     # "-XX:MaxDirectMemorySize=1000",
                     "org.micromanager.remote.HeadlessLauncher",
                     str(port),
-                    config_file,
+                    config_file if config_file is not None else '',
                     str(buffer_size_mb),
                     core_log_path,
                 ], cwd=mm_app_path, stdout=subprocess.PIPE