Cleanup: remove redundant code path

src/black/__init__.py

@@ -6604,12 +6604,6 @@ def can_omit_invisible_parens(
 
     penultimate = line.leaves[-2]
     last = line.leaves[-1]
-    if line.should_explode:
-        try:
-            penultimate, last = last_two_except(line.leaves)
-        except LookupError:
-            # Turns out we'd omit everything.  We cannot skip the optional parentheses.
-            return False
 
     if (
         last.type == token.RPAR
@@ -6683,24 +6677,6 @@ def _can_omit_closing_paren(line: Line, *, last: Leaf, line_length: int) -> bool
     return False
 
 
-def last_two_except(leaves: List[Leaf]) -> Tuple[Leaf, Leaf]:
-    """Return (penultimate, last) leaves skipping brackets in `omit` and contents."""
-    stop_after = None
-    last = None
-    for leaf in reversed(leaves):
-        if stop_after:
-            if leaf is stop_after:
-                stop_after = None
-            continue
-
-        if last:
-            return leaf, last
-
-        last = leaf
-    else:
-        raise LookupError("Last two leaves were also skipped")
-
-
 def run_transformer(
     line: Line,
     transform: Transformer,