Prevent sending transaction with 0 as amounts

silkaj tx --amountUD 0 -r 5B8iMAzq1dNmFe3ZxFTBQkqhq4fsztg1gZvxHXCk1XYH -r d88fPFbDdJXJANHH7hedFMaRyGcnVZj9c5cDaE76LRN -r 3i7jBZz1bYVTtao3C6e7cN21JHYjHCDR9pKeReE4rdVe
╒════════════════════════════════════════════╤══════════════════════════════════════════════╕
│ pubkey's balance before tx (unit|relative) │ 24608.27 Ğ1 | 2434.0524 UD Ğ1                │
├────────────────────────────────────────────┼──────────────────────────────────────────────┤
│ total transaction amount (unit|relative)   │ 0.0 Ğ1 | 0.0 UD Ğ1                           │
├────────────────────────────────────────────┼──────────────────────────────────────────────┤
│ pubkey's balance after tx (unit|relative)  │ 24608.27 Ğ1 | 2434.0524 UD Ğ1                │
├────────────────────────────────────────────┼──────────────────────────────────────────────┤
│ from (pubkey)                              │ GfKERHnJTYzKhKUma5h1uWhetbA8yHKymhVH2raf2aCP │
├────────────────────────────────────────────┼──────────────────────────────────────────────┤
│ from (id)                                  │ moul                                         │
├────────────────────────────────────────────┼──────────────────────────────────────────────┤
│ to (pubkey)                                │ 5B8iMAzq1dNmFe3ZxFTBQkqhq4fsztg1gZvxHXCk1XYH │
├────────────────────────────────────────────┼──────────────────────────────────────────────┤
│ amount (unit|relative)                     │ 0.0 Ğ1 | 0.0 UD Ğ1                           │
├────────────────────────────────────────────┼──────────────────────────────────────────────┤
│ to (pubkey)                                │ d88fPFbDdJXJANHH7hedFMaRyGcnVZj9c5cDaE76LRN  │
├────────────────────────────────────────────┼──────────────────────────────────────────────┤
│ amount (unit|relative)                     │ 0.0 Ğ1 | 0.0 UD Ğ1                           │
├────────────────────────────────────────────┼──────────────────────────────────────────────┤
│ to (pubkey)                                │ 3i7jBZz1bYVTtao3C6e7cN21JHYjHCDR9pKeReE4rdVe │
├────────────────────────────────────────────┼──────────────────────────────────────────────┤
│ amount (unit|relative)                     │ 0.0 Ğ1 | 0.0 UD Ğ1                           │
╘════════════════════════════════════════════╧══════════════════════════════════════════════╛
Do you confirm sending this transaction? [yes/no]: yes
Generate Transaction:
   - From:    GfKERHnJTYzKhKUma5h1uWhetbA8yHKymhVH2raf2aCP
   - To:      5B8iMAzq1dNmFe3ZxFTBQkqhq4fsztg1gZvxHXCk1XYH 
   - Amount:  0.0
   - To:      d88fPFbDdJXJANHH7hedFMaRyGcnVZj9c5cDaE76LRN 
   - Amount:  0.0
   - To:      3i7jBZz1bYVTtao3C6e7cN21JHYjHCDR9pKeReE4rdVe 
   - Amount:  0.0
   - Total:   0.0
Version: 10
Type: Transaction
Currency: g1
Blockstamp: 298437-000000786667ED2EFE811571DBE042E05A9DAD8A7347849CDAD600F0D6E129E2
Locktime: 0
Issuers:
GfKERHnJTYzKhKUma5h1uWhetbA8yHKymhVH2raf2aCP
Inputs:
1001:0:D:GfKERHnJTYzKhKUma5h1uWhetbA8yHKymhVH2raf2aCP:60119
Unlocks:
0:SIG(0)
Outputs:
1001:0:SIG(GfKERHnJTYzKhKUma5h1uWhetbA8yHKymhVH2raf2aCP)

It does not generate any outputs to the recipients. This results in a transaction to the sender. Nothing bad in Silkaj behaviour. I think we do not need this feature and we could avoid some issue by filtering 0 amounts.