Im trying to figure out if is is possible to ignore an error or skip an import if the file is not there

I have a directory node that spits out the files..
Then filters out certain ones by regex matching
these in turn go to excel import nodes...

One node may not always have a file.. Im using a switch at one point so that if there is data it feeds it into the results.
I just need to know how to tell it to ignore the excel node error and just continue on
Its passing in a blank string (or a Null if needed)