chore: Fix parent scope issue in FortranAST class

Fixes #329

Author: gnikit

CHANGELOG.md

@@ -42,6 +42,8 @@
 
 ### Fixed
 
+- Fixed bug where parent scope for includes in AST could be `None`
+  ([#329](https://github.com/fortran-lang/fortls/issues/329))
 - Fixed preprocessor bug with `if` and `elif` conditionals
   ([#322](https://github.com/fortran-lang/fortls/issues/322))
 - Fixed bug where type fields or methods were not detected if spaces were

fortls/parsers/internal/ast.py

@@ -272,8 +272,9 @@ def resolve_includes(self, workspace, path: str | None = None):
                     added_entities = []
                     for child in include_ast.inc_scope.children:
                         added_entities.append(child)
-                        parent_scope.add_child(child)
-                        child.update_fqsn(parent_scope.FQSN)
+                        if parent_scope is not None:
+                            parent_scope.add_child(child)
+                            child.update_fqsn(parent_scope.FQSN)
                     include_ast.none_scope = parent_scope
                     inc.scope_objs = added_entities