RPC validateaddress: test pwalletMain for NULL (no-wallet mode)
RPC validateaddress: test pwalletMain for NULL (no-wallet mode)

Conflicts:
	src/rpcwallet.cpp

Rebased-from: b878f6a92436e3facd700e2e10c04f541cd6421b

coinkeeper/2015-06-22_19-10_cannacoin,Cannacoin-Project/Cannacoin,coinkeeper/2015-06-22_18-46_reddcoin,Cannacoin-Project/Cannacoin,coinkeeper/2015-06-22_19-10_cannacoin,Cannacoin-Project/Cannacoin,joroob/reddcoin,reddcoin-project/reddcoin,coinkeeper/2015-06-22_19-10_cannacoin,ahmedbodi/poscoin,bmp02050/ReddcoinUpdates,joroob/reddcoin,bmp02050/ReddcoinUpdates,reddcoin-project/reddcoin,Cannacoin-Project/Cannacoin,ahmedbodi/poscoin,coinkeeper/2015-06-22_18-46_reddcoin,coinkeeper/2015-06-22_19-10_cannacoin,bmp02050/ReddcoinUpdates,ahmedbodi/poscoin,reddcoin-project/reddcoin,coinkeeper/2015-06-22_18-46_reddcoin,reddcoin-project/reddcoin,bmp02050/ReddcoinUpdates,coinkeeper/2015-06-22_18-46_reddcoin,joroob/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,ahmedbodi/poscoin,reddink/reddcoin,ahmedbodi/poscoin,reddink/reddcoin,joroob/reddcoin,reddink/reddcoin,reddink/reddcoin,Cannacoin-Project/Cannacoin,coinkeeper/2015-06-22_18-46_reddcoin,coinkeeper/2015-06-22_19-10_cannacoin,joroob/reddcoin,bmp02050/ReddcoinUpdates,reddink/reddcoin