fix: colored view not showing removed items when list is emptied (#575)

[r266-tech]

Problem

When comparing a list with an empty list using COLORED_VIEW, all removed items are silently dropped from the output. The str() representation returns [] instead of showing the removed items.

Reproduction

from deepdiff.helper import COLORED_VIEW
from deepdiff import DeepDiff

t1 = [1, 2, 3]
t2 = []
print(DeepDiff(t1, t2, view=COLORED_VIEW))  # prints [] instead of showing removed items

Root Cause

In deepdiff/colored_view.py, the list branch of _colorize_json checks if not obj: return '[]' before collecting removed items via self._get_path_removed(path). When t2 is empty, the function returns immediately without ever checking for removed items.

Fix

Move the empty check after collecting removed_map, and only return '[]' if both the object is empty AND there are no removed items.

Testing

• All 16 existing colored view tests continue to pass
• Added test_colored_view_list_all_removed to cover the empty list case

Fixes #575