[IMP] base_external_referentials: replaced search with id by exists method
[IMP] base_external_referentials: replaced search with id by exists method

js-landoo/connector,open-synergy/connector,BT-jmichaud/connector,fevxie/connector,maljac/connector,sylvain-garancher/connector,Endika/connector,zhaohuaw/connector,acsone/connector,guewen/connector,anybox/connector,dvitme/connector,open-synergy/connector,anybox/connector,Antiun/connector,BT-fgarbely/connector,gurneyalex/connector,acsone/connector,brain-tec/connector,Antiun/connector,hugosantosred/connector,MindAndGo/connector,js-landoo/connector,esousy/connector,mohamedhagag/connector,BT-fgarbely/connector,mohamedhagag/connector,acsone/connector,BT-ojossen/connector,brain-tec/connector,sylvain-garancher/connector,dvitme/connector,maljac/connector,fevxie/connector,guewen/connector,BT-jmichaud/connector,BT-ojossen/connector,MindAndGo/connector,Endika/connector,zhaohuaw/connector,gurneyalex/connector,esousy/connector,brain-tec/connector,hugosantosred/connector