- warn instead of raise error when file is empty upon closing

setup.py

@@ -5,7 +5,7 @@ with open('README.md', 'r') as fh:
 
 setuptools.setup(
     name='tiffwrite',
-    version='2022.5.4',
+    version='2022.6.0',
     author='Wim Pomp @ Lenstra lab NKI',
     author_email='w.pomp@nki.nl',
     description='Parallel tiff writer compatible with ImageJ.',

tiffwrite/__init__.py

@@ -1,3 +1,4 @@
+import os
 import tifffile
 import colorcet
 import struct
@@ -485,10 +486,14 @@ class IJTiffFile:
                                                dtype=int).T.flatten()]) for color in self.colors]
 
     def close(self):
-        assert len(self.frames_added) >= 1, 'at least one frame should be added to the tiff'
         if multiprocessing.current_process().pid == self.main_pid:
             self.pool_manager.close(self)
             with self.fh.lock() as fh:
+                if len(self.frames_added) == 0:
+                    warn('At least one frame should be added to the tiff, removing file.')
+                    fh.close()
+                    os.remove(self.path)
+                else:
                     if len(self.frames_written) < np.prod(self.shape):  # add empty frames if needed
                         for n in product(*[range(i) for i in self.shape]):
                             if n not in self.frames_written:
@@ -598,6 +603,7 @@ class PoolManager:
         self.tifs.pop(tif.path)
         if not self.tifs:
             self.__class__.instance = None
+            if self.is_alive:
                 self.is_alive = False
                 self.done.set()
                 while not self.queue.empty():