shell32: Simplify check for an empty string.
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@ -897,7 +897,7 @@ static HRESULT WINAPI ApplicationAssociationRegistration_QueryCurrentDefault(IAp
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*association = NULL;
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if((type == AT_URLPROTOCOL || type == AT_FILEEXTENSION) && !lstrlenW(query))
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if((type == AT_URLPROTOCOL || type == AT_FILEEXTENSION) && !query[0])
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return E_INVALIDARG;
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else if(type == AT_FILEEXTENSION && query[0] != '.')
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return E_INVALIDARG;
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