Discard blocks and tables that don't fit in remaining space

This condition had probably been added a long time ago when layout was done
differently. I don't see why it's there, removing it doesn't break tests and
makes page break before unbreakable blocks that go lower than the end of the
page instead of after.

I may have missed something. If this commit pops out of a git bisect, please
open an issue.

Related to #659 (even if the commit is not related to columns only).

weasyprint/layout/blocks.py

@@ -704,11 +704,7 @@ def block_container_layout(context, box, max_position_y, skip_stack,
                         new_child.border_box_y() + new_child.border_height())
 
                     if (new_position_y > max_position_y and
-                            (new_children or not page_is_empty) and
-                            not (isinstance(child, boxes.TableBox) or (
-                                # For blocks with children do this per child.
-                                isinstance(child, boxes.BlockBox) and
-                                child.children))):
+                            (new_children or not page_is_empty)):
                         # The child overflows the page area, put it on the
                         # next page. (But don’t delay whole blocks if eg.
                         # only the bottom border overflows.)