Fix console.print() with empty args to respect end parameter

[veeceey]

Summary

Fixes #3701

When console.print() was called with no arguments but a custom end parameter, it would print a newline instead of the end character. This was because empty objects were always replaced with NewLine() regardless of the end parameter.

Changes

• Modified Console.print() in rich/console.py to only use NewLine() when end is the default "\n"
• When end is a custom value, use an empty Text object that will properly render with the custom end character
• Added test test_print_empty_with_end() to verify the fix

Test plan

• Added regression test that verifies end parameter works with empty args
• All existing console print tests pass
• Manual testing confirms behavior matches regular print()

Before

from rich.console import Console
console = Console()

print(end="!")  # Prints: !
console.print(end="!")  # Prints: \n (newline)

After

from rich.console import Console
console = Console()

print(end="!")  # Prints: !
console.print(end="!")  # Prints: ! (correctly)

[veeceey]

Code changes verified ✓ Mergeable: YES | Ready for maintainer review.