fix: add ctx data dir check for database initialization

src/ctx/database.c

@@ -9,6 +9,11 @@ bool lm_ctx_database_init(lm_ctx_t *ctx){
   if(ctx->db != NULL)
     return true;
 
+  if(NULL == ctx->data){
+    lm_error_set(LM_ERR_CtxDataNULL);
+    return false;
+  }
+
   char dbpath[strlen(ctx->data)+10];
   join(dbpath, ctx->data, "db");