librc: fix rc_runlevel_exists return for empty string
This function should return false if the runlevel is an empty string.
    X-Gentoo-Bug: 803536
    X-Gentoo-Bug-URL: https://bugs.gentoo.org/803536
    Closes: https://github.com/OpenRC/openrc/pull/431
			
			
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		@@ -481,7 +481,8 @@ rc_runlevel_exists(const char *runlevel)
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	char path[PATH_MAX];
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						char path[PATH_MAX];
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	struct stat buf;
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						struct stat buf;
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	if (!runlevel || strcmp(runlevel, ".") == 0 || strcmp(runlevel, "..") == 0)
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						if (!runlevel || strcmp(runlevel, "") == 0 || strcmp(runlevel, ".") == 0 ||
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							strcmp(runlevel, "..") == 0)
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		return false;
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							return false;
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	snprintf(path, sizeof(path), "%s/%s", RC_RUNLEVELDIR, runlevel);
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						snprintf(path, sizeof(path), "%s/%s", RC_RUNLEVELDIR, runlevel);
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	if (stat(path, &buf) == 0 && S_ISDIR(buf.st_mode))
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						if (stat(path, &buf) == 0 && S_ISDIR(buf.st_mode))
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