bug: incomplete submodule setting name to None

The submodule AST node was setting the name of the
object to None instead of an empty string which caused
havoc in all sorts of places.

Fixes #233

Author: gnikit

fortls/langserver.py

@@ -301,7 +301,12 @@ def map_types(type, in_class: bool = False):
         # Add scopes to outline view
         test_output = []
         for scope in file_obj.ast.get_scopes():
-            if (scope.name[0] == "#") or (scope.get_type() == SELECT_TYPE_ID):
+
+            if (
+                not scope.name
+                or scope.name[0] == "#"
+                or scope.get_type() == SELECT_TYPE_ID
+            ):
                 continue
             scope_tree = scope.FQSN.split("::")
             if len(scope_tree) > 2:

fortls/objects.py

@@ -745,7 +745,7 @@ def __init__(
         file_ast: FortranAST,
         line_number: int,
         name: str,
-        ancestor_name: str = None,
+        ancestor_name: str = "",
     ):
         super().__init__(file_ast, line_number, name)
         self.ancestor_name = ancestor_name
@@ -766,7 +766,7 @@ def get_ancestors(self):
         return []
 
     def resolve_inherit(self, obj_tree, inherit_version):
-        if self.ancestor_name is None:
+        if not self.ancestor_name:
             return
         if self.ancestor_name in obj_tree:
             self.ancestor_obj = obj_tree[self.ancestor_name][0]

fortls/parse_fortran.py

@@ -586,8 +586,8 @@ def read_submod_def(line: str):
     if submod_match is None:
         return None
 
-    parent_name: str = None
-    name: str = None
+    parent_name: str = ""
+    name: str = ""
     trailing_line = line[submod_match.end(0) :].split("!")[0]
     trailing_line = trailing_line.strip()
     parent_match = FRegex.WORD.match(trailing_line)