suppress display of whitespace only text results
suppress display of whitespace only text results

when a whitespace only text result is detected,  don't
show it in the results table.
from https://github.ibm.com/Watson/developer-experience/issues/168

watson-developer-cloud/visual-recognition-nodejs,oremari/plantDiseaseSymptoms-vr-demo-1483744992341,watson-developer-cloud/visual-recognition-nodejs,oremari/plantDiseaseSymptoms-vr-demo-1483744992341