fix: Report correct number of missing messages in strict mode

[orangain]

Problem

There are two problems about the report of missing translations of lingui compile --strict:

1. The command reports the total number of translations not as the number of missing ones.
2. With --verbose option, missing values, which are always undefined, are reported. It is less useful.

Changes

This PR fixes the above problems. Under the following situation:

$ npx lingui extract
Catalog statistics for src/locales/{locale}/messages:
┌─────────────┬─────────────┬─────────┐
│ Language    │ Total count │ Missing │
├─────────────┼─────────────┼─────────┤
│ en (source) │      4      │    -    │
│ cs          │      4      │    3    │
└─────────────┴─────────────┴─────────┘

(use "npm run extract" to update catalogs with new messages)
(use "npm run compile" to compile catalogs for production)

Before

Reports the total number of translations as the number of missing ones:

$ npx lingui compile --strict
Compiling message catalogs…
Error: Failed to compile catalog for locale cs!
Missing 4 translation(s)

Reports undefined as the missing translations:

$ npx lingui compile --strict --verbose
Compiling message catalogs…
en ⇒ src/locales/en/messages.js
Error: Failed to compile catalog for locale cs!
Missing translations:
undefined
Příchozí zprávy
undefined
undefined

After

Reports the correct number of missing translations:

$ npx lingui compile --strict
Compiling message catalogs…
Error: Failed to compile catalog for locale cs!
Missing 3 translation(s)

Reports missing translation message Ids:

$ npx lingui compile --strict --verbose
Compiling message catalogs…
en ⇒ src/locales/en/messages.js
Error: Failed to compile catalog for locale cs!
Missing translations:
Last login on {0}.
See all <0>unread messages</0> or <1>mark them</1> as read.
{messagesCount, plural, one {There's # message in your inbox.} other {There are # messages in your inbox.}}

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[codecov]

Codecov Report

Merging #992 (d01c1a6) into main (77ec0bd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #992   +/-   ##
=======================================
  Coverage   83.30%   83.30%           
=======================================
  Files          53       53           
  Lines        1605     1605           
  Branches      430      430           
=======================================
  Hits         1337     1337           
  Misses        156      156           
  Partials      112      112           

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[semoal]

Lgtm, thanks mate