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498703fc81
Problematic part is
```codeql
/** A escape from string format with `markupsafe.Markup` as the format string. */
private class MarkupEscapeFromStringFormat extends MarkupSafeEscape, Markup::StringFormat {
override DataFlow::Node getAnInput() {
result in [this.getArg(_), this.getArgByName(_)] and
not result = Markup::instance()
}
override DataFlow::Node getOutput() { result = this }
}
```
since the char-pred still holds even if `getAnInput` has no results...
I will say that doing it this way feels kinda dirty, and we _could_ fix
this by including the logic in `getAnInput` in the char-pred as well.
But as I see it, that would just lead to a lot of code duplication,
which isn't very nice.