Fixed pylint CQ issues

Author: navjotcis

src/class_sqlThread.py

@@ -94,8 +94,8 @@ def versionThree(self):
             'In messages.dat database, adding tag field to'
             ' the inventory table.')
         item = '''ALTER TABLE inventory ADD tag blob DEFAULT '' '''
-        parameters = ''
-        self.cur.execute(item, parameters)
+        param = ''
+        self.cur.execute(item, param)
         item = '''update settings set value=? WHERE key='version';'''
         parameters = (4,)
         self.cur.execute(item, parameters)
@@ -184,8 +184,8 @@ def versionEight(self):
             'In messages.dat database, adding sighash field to'
             ' the inbox table.')
         item = '''ALTER TABLE inbox ADD sighash blob DEFAULT '' '''
-        parameters = ''
-        self.cur.execute(item, parameters)
+        param = ''
+        self.cur.execute(item, param)
         item = '''update settings set value=? WHERE key='version';'''
         parameters = (9,)
         self.cur.execute(item, parameters)