[Bug]: Crash when verifying a collection with 0 NFTs

[Callum McIntyre]

Issue description

1. Create an assets directory. Add collection.png + collection.json:

{
  "name": "Cool Collection",
  "symbol": "COOL",
  "description": "Collection of some stuff on the blockchain.",
  "image": "collection.png",
  "attributes": [],
  "properties": {
    "files": [
      {
        "uri": "collection.png",
        "type": "image/png"
      }
    ]
  }
}

2. Run sugar create-config, then sugar upload, then sugar launch

3. Everything will upload and be deployed correctly, but the verification in sugar launch will error with a division by zero

I think this is a valid use case, eg. if you wanted to start with an empty collection and then have your app mint NFTs into it.

Relevant log output

$ sugar create-config
[1/2] 🍬 Sugar interactive config maker

Check out our Candy Machine config docs to learn about the options:
  -> https://docs.metaplex.com/tools/sugar/configuration

✔ What is the price of each NFT? · 0.1
✔ How many NFTs will you have in your candy machine? · 0
✔ What is the symbol of your collection? Hit [ENTER] for no symbol. · COOL
✔ What is the seller fee basis points? · 200
? What is your go live date? Many common formats are supported. If unsure, try YYYY-MM-DD HH:MM:SS [+/-]UTC-OFFSET or type 'now' for current time. For example 2022-05-02 18:00:00 +0000 for May 2, 2022 18:00:0
✔ What is your go live date? Many common formats are supported. If unsure, try YYYY-MM-DD HH:MM:SS [+/-]UTC-OFFSET or type 'now' for current time. For example 2022-05-02 18:00:00 +0000 for May 2, 2022 18:00:00 UTC. · now
✔ How many creator wallets do you have? (max limit of 4) · 1
✔ Enter creator wallet address #1 · Fkc4FN7PPhyGsAcHPW3dBBJ4BvtYkDr2rBFBgFpvy3nB
✔ Enter royalty percentage share for creator #1 (e.g., 70). Total shares must add to 100. · 100
? Which extra features do you want to use? (use [SPACEBAR] to select options you want and hit [ENTER] wh
✔ Which extra features do you want to use? (use [SPACEBAR] to select options you want and hit [ENTER] when done) · 
✔ What is your SOL treasury address? · Fkc4FN7PPhyGsAcHPW3dBBJ4BvtYkDr2rBFBgFpvy3nB
✔ What upload method do you want to use? · Bundlr
✔ Do you want to retain update authority on your NFTs? We HIGHLY recommend you choose yes. · yes
✔ Do you want your NFTs to remain mutable? We HIGHLY recommend you choose yes. · yes

[2/2] 📝 Saving config file

Saving config to file: "config.json"

Successfully generated the config file. 🎉 

✅ Command successful.

$ sugar upload
[1/4] 🗂  Loading assets
Found 1 asset pair(s), uploading files:
+--------------------+
| images    |      1 |
| metadata  |      1 |
+--------------------+

[2/4] 🖥  Initializing upload
▪▪▪▪▪ Connected
Funding address:
  -> pubkey: 9AUvdLggr4DezH1FEHFBVqQPNUF9q6sZGTYoPMyum2sk
  -> lamports: 99243 (◎ 0.000099243)
Signature: zkMvNMg3fRyDgdNuNUDQxy5zKEr34JQHuvJDSff1CTD1cE6SD15t1V1F2uWiUQW9QUtTix3Q4CySihrYfGUvDEM

[3/4] 📤 Uploading image files 

Sending data: (Ctrl+C to abort)
[00:00:01] Upload successful ███████████████████████████████████████████████████████████████████████ 1/1

[4/4] 📤 Uploading metadata files 

Sending data: (Ctrl+C to abort)
[00:00:00] Upload successful ███████████████████████████████████████████████████████████████████████ 1/1

1/1 asset pair(s) uploaded.

✅ Command successful.

$ sugar launch
Starting Sugar launch... 🚀 

>>> sugar validate

[1/1] 🗂  Loading assets
▪▪▪▪▪ Validating 1 metadata file(s)...

Validation complete, your metadata file(s) look good.

>>> sugar upload

[1/4] 🗂  Loading assets
Found 1 asset pair(s), uploading files:
+--------------------+
| images    |      0 |
| metadata  |      0 |
+--------------------+

....no files need uploading, skipping remaining steps.

1/1 asset pair(s) uploaded.

>>> sugar deploy

[1/3] 🍬 Creating candy machine
Candy machine ID: DqfEXKYn8Nct9xaY8A5xj2DUNkwZw8cJKXWS1Wwqt4oK

[2/3] 📦 Creating and setting the collection NFT for candy machine
Collection mint ID: DCBN7vi2nqQARtE4GQfVcgm58gAgvHCjvs99UfGJtnrm

[3/3] 📝 Writing config lines

All config lines deployed.

>>> sugar verify

[1/2] 🍬 Loading candy machine
▪▪▪▪▪ Completed

[2/2] 📝 Verification
Verifying 0 config line(s): (Ctrl+C to abort)
████████████████████████████████████████████████████████████████████████████████████████████████████ 0/0
thread 'main' panicked at 'attempt to divide by zero', src/verify/process.rs:97:25

Priority this issue should have

Low (slightly annoying)