issue2551025: try handling operational error exception in close #2

Looks like stdout reports:

  (2006, '')

so try it. Also only run mysql tests w/o codecov tests to cut down on
cycle time.

Author: rouilj

.travis.yml

@@ -84,7 +84,7 @@ before_install:
   - cd $TRAVIS_BUILD_DIR
 
 install:
-  #test#  - pip install mysqlclient==1.3.13
+#test#  - pip install mysqlclient==1.3.13
   - pip install mysqlclient
   - pip install psycopg2
   - pip install gpg pytz whoosh pyjwt
@@ -108,7 +108,9 @@ before_script:
 script:
   - PATH=$VIRTUAL_ENV/bin:$PATH
   - export LD_LIBRARY_PATH=$VIRTUAL_ENV/lib:$LD_LIBRARY_PATH
-  - py.test -v test/ --cov=roundup
+  - py.test -v test/test_mysql.py
+#test#  - py.test -v test/ --cov=roundup
+  
 
-after_success:
-  - codecov
+#test#after_success:
+#test#  - codecov

roundup/backends/back_mysql.py

@@ -592,7 +592,7 @@ def sql_close(self):
         # raised for closing a closed handle.
         except MySQLdb.OperationalError as message:
             print str(message)
-            if str(message) != '':
+            if str(message) != "(2006, '')":  # close connection
                 raise
         except MySQLdb.ProgrammingError as message:
             if str(message) != 'closing a closed connection':