Add checks for is_empty.
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@@ -1003,7 +1003,7 @@ impl Engine {
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let sub_module = iter.next().expect("contains separator").trim();
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let remainder = iter.next().expect("contains separator").trim();
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if !root.contains_key(sub_module) {
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if root.is_empty() || !root.contains_key(sub_module) {
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let mut m = Module::new();
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register_static_module_raw(m.sub_modules_mut(), remainder, module);
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m.build_index();
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