Failed start random game if change number of players

[nwtour]

Start game, 5 players in gamesettings (4 AI Petra) - successfull started

Change num of players to 4 (minus 1) - failed loading

Restart game: in gamesettings 5 players 3 AI and 1 unassigned

Creating playerbases...ERROR: JavaScript error: maps/random/rmgen-common/player.js line 66
g_CivData[getCivCode(...)] is undefined
  getStartingEntities@maps/random/rmgen-common/player.js:66:19
  placeCivDefaultStartingEntities@maps/random/rmgen-common/player.js:111:44
  placePlayerBase@maps/random/rmgen-common/player.js:159:33
  placePlayerBases@maps/random/rmgen-common/player.js:147:18
  @maps/random/volcanic_lands.js:42:17
ERROR: CMapGeneratorWorker::Run: Failed to load RMS 'maps/random/volcanic_lands.js'

[bb]

In 26464:

Let StartingCamera react upon change in number of players

fixes an issue in rP26393

Reviewed By: marder
Comments By: nwtour

Differential Revision: D4498
fixes #6435