Issue

• I'm using Drools Template feature by ExternalSpreadsheetCompiler with DRT and XLS files. I see that the generate DRL line is discarded when one of data in XLS is empty. I want to discard the complete fact pattern only when all attribute data are empty. Let's suppose that we have a DRT like this:

rule "person_@{row.rowNumber}"
    when
        $p : Person( age <= @{age}, gender=="@{gender}" )
    then
        //
end

And we have cell values like this:

age    , gender
----------------
18     ,f
18     ,<empty>
<empty>,f
<empty>,<empty>

I expect

rule "person_1"
    when
        $p : Person( age <= 18, gender=="f" )
    then
        //
end

rule "person_2"
    when
        $p : Person( age <= 18 )
    then
        //
end

rule "person_3"
    when
        $p : Person( gender=="f" )
    then
        //
end

rule "person_4"
    when

    then
        //
end

But actually, it is rendered like:

rule "person_1"
    when
        $p : Person( age <= 18, gender=="f" )
    then
        //
end

rule "person_2"
    when

    then
        //
end

rule "person_3"
    when

    then
        //
end

rule "person_4"
    when

    then
        //
end