Fixed #127 : SyaNodeParser : Allow tokens parsing

Fixed #128 : parser_utils.get_node() : Refactor

src/core/sheerka/services/SheerkaConceptManager.py

@@ -1152,7 +1152,7 @@ class SheerkaConceptManager(BaseService):
         :return:
         """
 
-        if token.type == TokenKind.WHITESPACE:
+        if token.type in (TokenKind.WHITESPACE, TokenKind.EXPR):
             return None
 
         if token.type == TokenKind.STRING:

src/core/sheerka/services/SheerkaExecute.py

@@ -169,7 +169,10 @@ class ParserInput:
         return True
 
     def is_empty(self):
-        if self.text.strip() == "":
+        if self.text is not None and self.text.strip() == "":
+            return True
+
+        if self.from_tokens and len(self.tokens) == 0:
             return True
 
         if self.end == self.start: