I am concatenating a few string fields using the CONCAT() function. Here is the code:

```
CONCAT(a.[OrganizationalUnit], ' - ', a.[Level1], ' - ', a.[Level2], ' - ', a.[Level3], ' - ', a.[Level4], ' - ', a.[Level5], ' - ', a.[Level6], ' - ', a.[Level7], ' - ', a.[Level8], ' - ', a.[Level9], ' - ', a.[Level10], ' - ', a.[Level11], ' - ', a.[Level12], ' - ', a.[Level13], ' - ', a.[Level14]) AS Organization

```

There are some fields that are null. When this happens, I receive a series of dashes in the output. Is there a way I can get rid of those when the fields are blank? Here is an example of output:

Company123 - Countries - LC BR - BR - RCL - 5510-RC BR (V) - EM - DG - - - - - - -