append 0 to char array, so that it will never be an empty array.
append 0 to char array, so that it will never be an empty array.

mscheng/pcaspy,tectronics/pcaspy,paulscherrerinstitute/pcaspy,tectronics/pcaspy,HaveF/pcaspy,paulscherrerinstitute/pcaspy,HaveF/pcaspy,paulscherrerinstitute/pcaspy,mscheng/pcaspy