No posts in a category: error

Selecting a category from edit.php in which there are no posts returns three PHP warnings [1] and one SQL[2] error.

1. Invalid argument supplied for foreach() in wp-blog-header.php line 325
2. implode(): Bad arguments in wp-blog-header.php line 328.
3. Invalid argument supplied for foreach() in wp-blog-header.php line 335

• [You have an error in your SQL syntax near ‘)’ at line 4]
  SELECT DISTINCT…