how to remove null space multiline output in oracle workflow notification

Hi Team,

I have requirement in oracle workflow notification related.

Ship to address having  address1,address2,address3,address4 and address5 values.

The requirement is two display in multiple line for SHIP TO ADDRESS FIELD

Am able to print as per the requirement but if any null spaces are coming in address4 and address3 its printing null ..

Output looks not good ..

How can we remove that spaces when we have null values

For reference output and corresponding code as shown

  p_document_inout :=

               p_document_inout

            || '<tr style="font-family:Arial,Helvetica,Geneva,sans-serif;font-size:x-small;text-align:Left;vertical-align:baseline;background-color:##e7e7e7;color:#17202a">';