Index: gc_core/py/grammar_checker.py
==================================================================
--- gc_core/py/grammar_checker.py
+++ gc_core/py/grammar_checker.py
@@ -57,11 +57,11 @@
 
     def getParagraphWithErrors (self, sText, dOptions=None, bEmptyIfNoErrors=False, bSpellSugg=False, nWidth=100, bDebug=False):
         "parse text and return a readable text with underline errors"
         aGrammErrs, aSpellErrs = self.getParagraphErrors(sText, dOptions, False, bSpellSugg, bDebug)
         if bEmptyIfNoErrors and not aGrammErrs and not aSpellErrs:
-            return ""
+            return ("", [])
         return text.generateParagraph(sText, aGrammErrs, aSpellErrs, nWidth)
 
     def getTextWithErrors (self, sText, bEmptyIfNoErrors=False, bSpellSugg=False, nWidth=100, bDebug=False):
         "[todo]"