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commit 5f3598a700e8e028f9140682262869ca319597ee
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Author: Panu Matilainen <pmatilai@redhat.com>
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Date:   Fri Sep 6 16:31:25 2013 +0300
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    Fix segfault executing a -p <lua> scriptlet without a body (RhBug:1004062)
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    - There are any number of places where this could be fixed, but
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      to keep the behavior similar to eg /bin/sh scriptlet without a body,
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      just turn a non-existent script into an empty string.
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diff --git a/rpmio/rpmlua.c b/rpmio/rpmlua.c
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index 0576318..921cc37 100644
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--- a/rpmio/rpmlua.c
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+++ b/rpmio/rpmlua.c
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@@ -526,6 +526,8 @@ int rpmluaRunScript(rpmlua _lua, const char *script, const char *name)
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     int ret = 0;
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     if (name == NULL)
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 	name = "<lua>";
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+    if (script == NULL)
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+	script = "";
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     if (luaL_loadbuffer(L, script, strlen(script), name) != 0) {
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 	rpmlog(RPMLOG_ERR, _("invalid syntax in lua script: %s\n"),
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 		 lua_tostring(L, -1));