REPLACE In Derived Column Transform Causing Repeat Data In Rows That Should Be Blank

W2k3 server, SQL 2005.
@@version = Microsoft SQL Server 2005 - 9.00.1399.06 (Intel X86)
Standard Edition on Windows NT 5.2
(Build 3790: Service Pack 1)

I have my first SSIS package almost working, but I'm having an odd problem and can't find any information to help resolve it.

I'm importing from a flat file (csv) to an existing table (append). I've got a Derived Column transformation in the middle to do some data cleanup. It's all working except for one little problem...

One of the transformations is 'REPLACE([Column 3],"^","; ")', output to a new column. (The input file has a field that uses carets as delimiters between an unknown number of items; I'm changing that to semicolons for easier reading.) Not all rows have data in this column, some will have one item, some will have multiple items.

The REPLACE works except that it fills in repeated data for all the blank rows.

Example:

Incoming data is:

1 Smith,Jane^Jones,Jane

2 Brown,John

3

4 Adams,James^Adams,Jim

5

6 White,Debra

Data inserted into the table is:

1 Smith,Jane; Jones,Jane

2 Brown,John

3 Brown,John

4 Adams,James; Adams,Jim

5 Adams,James; Adams,Jim

6 White,Debra

I've tried to use a Conditional to skip the empty rows, but I can't get that working at all (get syntax errors no matter what I put in).

Any suggestions on how to fix this would be most appreciated!

Thank you.