Fix deprecation warning

[jdanino]

Summary

Fixed a deprecation warning because of a nullable parameter to the reflection class constructor by adding and emtyp string as a default.

ReflectionClass::__construct(): Passing null to parameter #1 ($objectOrClass) of type object|string is deprecated

Type of change

• Bug fix (non-breaking change which fixes an issue)

[rrpadilla]

Hi @barryvdh, confirming this fixed the deprecation warning. Thanks.

ReflectionClass::__construct(): Passing null to parameter #1 ($objectOrClass) 
of type object|string is deprecated in 
/vendor/barryvdh/laravel-ide-helper/src/Console/MetaCommand.php on line 98

[barryvdh]

If it's null, it wouldn't make sense to try to make a reflection of it, right?

[mfn]

Agreed, if the line above

$concrete = $this->laravel->make($abstract);

produces null in $concrete, something else is weird

[mfn]

Superseded by #1351 which gives more details what's going on and does not silently coerce null into '', thank you though for this PR 🙏🏼