awk errors when running `build.sh`

So I downloaded bat-extras by cloning into my home directory. Afterwards, I ran `./build.sh` without any options (and not having `shfmt`)

I got the following error messages:

```
Verifying scripts...
Submodule 'best' (https://github.com/eth-p/best.git) registered for path '.test-framework'
Cloning into '/home/pepoluan/Downloads/bat-extras/.test-framework'...
awk: line 12: regular expression compile failed (missing operand)
^( |\t)()(description|snapshot).*
awk: line 12: regular expression compile failed (missing operand)
^( |\t)()(description|snapshot).*
awk: line 12: regular expression compile failed (missing operand)
^( |\t)()(description|snapshot).*
awk: line 12: regular expression compile failed (missing operand)
^( |\t)()(description|snapshot).*
awk: line 12: regular expression compile failed (missing operand)
^( |\t)()(description|snapshot).*
awk: line 12: regular expression compile failed (missing operand)
^( |\t)()(description|snapshot).*
awk: line 12: regular expression compile failed (missing operand)
^( |\t)()(description|snapshot).*
awk: line 12: regular expression compile failed (missing operand)
^( |\t)()(description|snapshot).*
awk: line 12: regular expression compile failed (missing operand)
^( |\t)()(description|snapshot).*
awk: line 12: regular expression compile failed (missing operand)
^( |\t)()(description|snapshot).*
Verified successfully.
```

The 'built' files do appear in the `bin/` directory, and a quick test of them seems to indicate they all working as expected.

Is this normal?