Description of problem:

taskotop cannot run when database is not running

# db-control stop
# taskotop 
Traceback (most recent call last):
  File "/usr/bin/taskotop", line 172, in <module>
    curses.wrapper(main)
  File "/usr/lib64/python2.6/curses/wrapper.py", line 43, in wrapper
    return func(stdscr, *args, **kwds)
  File "/usr/bin/taskotop", line 150, in main
    rhnSQL.initDB()
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/__init__.py", line 158, in initDB
    raise_with_tb(e, sys.exc_info()[2])
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/__init__.py", line 145, in initDB
    __init__DB(backend, host, port, username, password, database, sslmode, sslrootcert)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/__init__.py", line 57, in __init__DB
    __DB.connect()
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/driver_postgresql.py", line 195, in connect
    return self.connect(reconnect=reconnect - 1)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/driver_postgresql.py", line 200, in connect
    "All attempts to connect to the database failed"), sys.exc_info()[2])
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/driver_postgresql.py", line 185, in connect
    self.dbh = psycopg2.connect(" ".join("%s=%s" % (k, re.escape(str(v))) for k, v in dsndata.items()))
spacewalk.server.rhnSQL.sql_base.SQLConnectError: (None, None, 'rhnschema', 'All attempts to connect to the database failed')


and fails if you stop database when it runs

# taskotop 
Traceback (most recent call last):
  File "/usr/bin/taskotop", line 172, in <module>
    curses.wrapper(main)
  File "/usr/lib64/python2.6/curses/wrapper.py", line 43, in wrapper
    return func(stdscr, *args, **kwds)
  File "/usr/bin/taskotop", line 162, in main
    [format_run(run) for run in get_tasko_runs(60)]
  File "/usr/bin/taskotop", line 47, in get_tasko_runs
    task_query.execute(timelimit = datetime.datetime.now() - datetime.timedelta(seconds=maximum_age))
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/sql_base.py", line 151, in execute
    return self._execute_wrapper(self._execute, *p, **kw)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/driver_postgresql.py", line 296, in _execute_wrapper
    retval = function(*p, **kw)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/sql_base.py", line 205, in _execute
    return self._execute_(args, kwargs)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnSQL/driver_postgresql.py", line 318, in _execute_
    self._real_cursor.execute(self.sql, params)
psycopg2.OperationalError: server closed the connection unexpectedly
	This probably means the server terminated abnormally
	before or while processing the request.

I would expect some user friendly error messages instead of tracebacks



Version-Release number of selected component (if applicable):
spacewalk-utils-2.5.1-10.el6sat.noarch

How reproducible:
always

Steps to Reproduce:
1. taskotop
2. db-control stop / rhn-satellite-restart

Actual results:
tracebacks

Expected results:
error messages