🥅 Validate that Atom and Flag are not empty (backports #684)#685
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`Atom` and `Flag` have only been used for argument validation since v0.6.4 (as well as v0.5.14 and v0.4.24), and they validated for absense of `atom-specials`. But they failed to check that the strings are not empty. While this could be used to create syntax errors, I don't believe it amounts a security vulnerability. The result would be no different from any other `BAD` server response, which an application must be prepared to handle.
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Backports #684 to
v0.5-stable.AtomandFlaghave only been used for argument validation since v0.6.4 (as well as v0.5.14 and v0.4.24), and they validated for absense ofatom-specials. But they failed to check that the strings are not empty.While this could be used to create syntax errors, I don't believe it amounts a security vulnerability. The result would be no different from any other
BADserver response, which an application must be prepared to handle.