countTestCasesTS should handle the sufficient right errors

[lczub]

extended travis config, which runs TestLinkExample against TL Demo, aborts with an error (see build job 45.4 ).
Reason seams to be, that the used test account pyTLapi has not the right, to get info of all test cases from all test projects.

countTestCasesTS should handle the sufficient right errors

Number of TestPlans                : 249 
Number of TestSuites               : 99 
Traceback (most recent call last):
  File "example/TestLinkExample.py", line 688, in <module>
    print("Number of TestCases (in TestSuites): %s " % myTestLink.countTestCasesTS())
  File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/testlink/testlinkapi.py", line 416, in countTestCasesTS
    TestSuite['id'],'true','full')
  File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/testlink/testlinkdecorators.py", line 140, in wrapperReplaceTLResponseError
...
testlink.testlinkerrors.TLResponseError: 2010: User corresponding to Developer Key has insufficient rights to perform this action- Details: right mgt_view_tc, test project id: 5922, test plan id: 
getTestCasesForTestSuite({'details': 'full', 'testsuiteid': '5941', 'devKey': '3ec96581bb3d8a34cd28ce338b641063', 'deep': 'true'})
The command "if [[ $TESTLINK_API_PYTHON_SERVER_URL && $TRAVIS_PYTHON_VERSION == '3.4' ]]; then python example/TestLinkExample.py; fi" exited with 1.

[lczub]

currently no further action planned, cause online TL demo applicatio is down over one year and these test are not runable