Sam Atkins a451810599 AK: Print a better error message when missing a SourceGenerator key ...

Previously, if you forgot to set a key on a SourceGenerator, you would
get this less-than-helpful error message:

> Generate_CSS_MediaFeatureID_cpp:
  /home/sam/serenity/Meta/Lagom/../../AK/Optional.h:174: T
  AK::Optional<T>::release_value() [with T = AK::String]: Assertion
  `m_has_value' failed.

Now, it instead looks like this:

> No key named `name:titlecase` set on SourceGenerator
  Generate_CSS_MediaFeatureID_cpp:
  /home/sam/serenity/Meta/Lagom/../../AK/SourceGenerator.h:44:
  AK::String AK::SourceGenerator::get(AK::StringView) const: Assertion
  `false' failed.

2022-03-09 23:06:30 +01:00

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