Needed to make regex group optional for Python 3.8

Author: emanlove

atest/acceptance/create_webdriver.robot

@@ -30,7 +30,7 @@ Create Webdriver With Bad Keyword Argument Dictionary
     [Documentation]    Invalid arguments types
     ${status}    ${error} =    Run Keyword And Ignore Error    Create Webdriver    Firefox    kwargs={'spam': 'eggs'}
     Should Be Equal    ${status}    FAIL
-    Should Match Regexp    ${error}    (TypeError: (?:WebDriver.)__init__\\(\\) got an unexpected keyword argument 'spam'|kwargs must be a dictionary\.)
+    Should Match Regexp    ${error}    (TypeError: (?:WebDriver.)?__init__\\(\\) got an unexpected keyword argument 'spam'|kwargs must be a dictionary\.)
 
 *** Keywords ***
 Set Driver Variables