Description of problem:
When I try to build the spec file for the Seurat module, it will hangs.
Building the spec file for other packages will work.

Version-Release number of selected component (if applicable):
R2spec-4.2.1-1.el7.noarch


How reproducible:
Every time

Steps to Reproduce:
1. call R2spec --no-suggest --no-check -p Seurat --verbose --debug


Actual results:
It hangs with:
R2spec --no-suggest --no-check -p Seurat --debug                                                                                                                           
INFO:R2spec:Not Found: Seurat in http://bioconductor.org/packages/release/bioc/src/contrib/PACKAGES
INFO:R2spec:Not Found: Seurat in http://bioconductor.org/packages/release/data/annotation/src/contrib/PACKAGES
INFO:R2spec:Not Found: Seurat in http://bioconductor.org/packages/release/data/experiment/src/contrib/PACKAGES
INFO:R2spec:Package found in : http://cran.r-project.org/src/contrib/PACKAGES
INFO:R2spec:Sources are already present, no need to re-download
INFO:R2spec:Opening: /home/fbuettn/rpmbuild/SOURCES/Seurat_3.1.4.tar.gz
INFO:R2spec:Loading "Seurat/DESCRIPTION"
INFO:R2spec:Determining if the package is arch dependant or not
INFO:R2spec:Package is arch dependant
INFO:R2spec:Removing extracted sources: "Seurat"
INFO:R2spec:Filling spec variable from info collected

Expected results:
Working spec file.