bug fix: no specified networks still led to multi-network path
bug fix: no specified networks still led to multi-network path

kelcecil/flannel,jonboulle/flannel,coreos/flannel,endocode/flannel,Yhgenomics/flannel,coreos/flannel,endocode/flannel,coreos/flannel,adiclepcea/flannel,adiclepcea/flannel,endocode/flannel,jonboulle/flannel,adiclepcea/flannel,kelcecil/flannel,jonboulle/flannel,Yhgenomics/flannel,kelcecil/flannel,ingvagabund/flannel,ingvagabund/flannel,Yhgenomics/flannel,ingvagabund/flannel