No check for name collision before issuing fincontract with -s option

[s-tikhomirov]

Consider the following:

create-fincontract -i 0x0 -s one One(USD)
create-fincontract -i 0x0 -s one One(EUR)

Observed output of the second command:

sender info One transaction was sent. HASH: 0x8c6517452e
desc-deploy info One primitive stored with ID: 0x0cf1b7b5e0
sender info createFincontract transaction was sent. HASH: 0x76f9acfbbb
deploy info Fincontract: 0x3b4011777f
deploy info Created for: 0xebd0a594e3
sender info issueFor transaction was sent. HASH: 0x5a2c2d01a6
deploy info Fincontract: 0x3b4011777f
deploy info Issued for:  0x0000000000
ℹ ID added to autocomplete!
⚠ Fincontract with this name already exists!

That is, One(EUR) is issued, but not saved.

Possibly better outcome:

⚠ Fincontract with this name already exists!

(One(EUR) is not issued until the user removes -s option or changes the name).