Improve error message for missing class in Flow annotation driver
The Flow annotation driver will throw an error if a class is not found in the class schema. The error could be more helpful for missing classes or wrongly named classes if it would check if the class exists at all.
Uncaught Exception No class schema found for "MyVendor\MyProject\Domain\Model\Bar". The class should probably marked as entity or value object! This happened while examining "MyVendor\MyProject\Domain\Model\Foo"
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