(Summary) When typing: "/scoreboard teams list (team_name)" into Command Block and giving it a pulse, it does not produce desired effect
What I expected to happen was...:
I thought the command block would broadcast all players on team to the chat console for all players to see
What actually happened was...:
Command Block did not execute any command
Steps to Reproduce:
1. Create a team using the /scoreboard command. Join said team
2. Type /scoreboard team list (YourTeamName) into a command block
3. Give redstone pulse to command block
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Confirmed. I think the cause of this bug is that
/scoreboard teams list
does not report anything to anyone besides oneself, and the command block is just doing the same thing.
Related: the 'objectives list', 'players list', and 'players list <playername>' commands are the same. That last one lets you output all scores of the specified player, but again, does not work in a command block.
Perhaps the description/title can be edited to acknowledge this applies to all list commands?
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Confirmed for 1.5
Can the title/description be edited to acknowledge that this also applies to 'objectives list', 'players list', and 'players list <playername>' as well? Or do we have separate tickets for these?

These commands give feedback to the one who executed them. In this case, the command block will silently ignore them. This is intended design and asking for the commands to instead broadcast this info by specialcasing commandblocks would be a feature request.