ProcessRawGEOData fails when supp files is None

In the ProcessRawGEOData function the following line was changed to remove the or None option.  This caused processing of any dataset that didn't have supp files to completely fail.  This needs to be modified so that when the occasionally None comes in everything doesn't fail.

``` r
is.affy.file <- all(grepl("\\.cel$|\\.cel\\.", supp.files,  ignore.case = TRUE))
```
