Assert string arguments are not null #335
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For these functions, providing a null pointer argument would result in invoking undefined behavior.
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For these functions, providing a null pointer argument would result in invoking undefined behavior. As far as I know, these are the last functions in CSFML where nullptr args could potentially be converted into a
std::stringthus invoking UB. We have moreconst char*parameters but those values get checked for nullness before use so UB is not a concern in those cases.