print_location: Remove trailing whitespace from empty lines

Replicates graphql/graphql-js@5c42dc6

Author: Cito

src/graphql/language/print_location.py

@@ -70,5 +70,9 @@ def print_prefixed_lines(*lines: Tuple[str, Optional[str]]) -> str:
     ]
     pad_len = max(len(line[0]) for line in existing_lines)
     return "\n".join(
-        map(lambda line: line[0].rjust(pad_len) + " | " + line[1], existing_lines)
+        map(
+            lambda line: line[0].rjust(pad_len)
+            + (" | " + line[1] if line[1] else " |"),
+            existing_lines,
+        )
     )

tests/error/test_print_location.py

@@ -75,6 +75,6 @@ def prints_line_numbers_with_correct_padding():
             Test:9:1
              9 | *
                | ^
-            10 |\x20
+            10 |
             """
         )

tests/language/test_lexer.py

@@ -61,17 +61,17 @@ def skips_whitespace_and_comments():
 
     def errors_respect_whitespace():
         with raises(GraphQLSyntaxError) as exc_info:
-            lex_one("\n\n    ?\n\n\n")
+            lex_one("\n\n    ?\n")
 
         assert str(exc_info.value) + "\n" == dedent(
             """
             Syntax Error: Cannot parse the unexpected character '?'.
 
             GraphQL request:3:5
-            2 |\x20
+            2 |
             3 |     ?
               |     ^
-            4 |\x20
+            4 |
             """
         )
 
@@ -85,10 +85,10 @@ def updates_line_numbers_in_error_for_file_context():
             Syntax Error: Cannot parse the unexpected character '?'.
 
             foo.js:13:6
-            12 |\x20
+            12 |
             13 |      ?
                |      ^
-            14 |\x20
+            14 |
             """
         )