Merge pull request #69 from python-thread/fix/enforce-nonempty-dataset

Fix: enforce nonempty dataset

Author: caffeine-addictt

src/thread/thread.py

@@ -368,9 +368,11 @@ def __init__(
 
         Raises
         ------
+        AssertionError: invalid `dataset`
         AssertionError: invalid `max_threads`
         """
-        assert 0 <= max_threads, 'Cannot run a thread pool with max threads set to 0'
+        assert len(dataset) > 0, 'dataset cannot be empty'
+        assert 0 <= max_threads, 'max_threads cannot be set to 0'
 
         self._threads = []
         self._completed = 0