Fix attributeerror when using spinbox in parametertree
Fix attributeerror when using spinbox in parametertree

nmearl/pyqtgraph,tropp/acq4,ng110/pyqtgraph,carlomt/dicom_tools,mpvismer/pyqtgraph,meganbkratz/acq4,meganbkratz/acq4,mpvismer/pyqtgraph,mgraupe/acq4,jlombacher/pyqtgraph,onlyjus/pyqtgraph,ddamiani/pyqtgraph,benvermaercke/pyqtgraph,acq4/acq4,pbmanis/acq4,ddamiani/pyqtgraph,nmearl/pyqtgraph,ericdill/pyqtgraph,pmaunz/pyqtgraph,meganbkratz/acq4,ddamiani/pyqtgraph,acq4/acq4,acq4/acq4,mgraupe/acq4,acq4/acq4,mgraupe/acq4,meganbkratz/acq4,gvalentine/pyqtgraph,JenSte/pyqtgraph,pmaunz/pyqtgraph,welshjf/pyqtgraph,petebachant/pyqtgraph,stscieisenhamer/pyqtgraph,derricw/pyqtgraph,onlyjus/pyqtgraph,pbmanis/acq4,stscieisenhamer/pyqtgraph,tropp/acq4,campagnola/acq4,gvalentine/pyqtgraph,tropp/acq4,Lx37/pyqtgraph,welshjf/pyqtgraph,welshjf/pyqtgraph,duguxy/pyqtgraph,Lx37/pyqtgraph,campagnola/acq4,carlomt/dicom_tools,duguxy/pyqtgraph,benvermaercke/pyqtgraph,onlyjus/pyqtgraph,benvermaercke/pyqtgraph,campagnola/acq4,mgraupe/acq4,ng110/pyqtgraph,tropp/acq4,pbmanis/acq4,mgraupe/acq4,ericdill/pyqtgraph,jlombacher/pyqtgraph,campagnola/acq4,derricw/pyqtgraph,pbmanis/acq4,gvalentine/pyqtgraph,ericdill/pyqtgraph,JenSte/pyqtgraph,petebachant/pyqtgraph