Ensure UpdateDnnManifests doesn't run for building dev site (#3314)
Ensure UpdateDnnManifests doesn't run for building dev site (#3314)


valadas/Dnn.Platform,dnnsoftware/Dnn.Platform,bdukes/Dnn.Platform,bdukes/Dnn.Platform,dnnsoftware/Dnn.Platform,mitchelsellers/Dnn.Platform,nvisionative/Dnn.Platform,bdukes/Dnn.Platform,dnnsoftware/Dnn.Platform,nvisionative/Dnn.Platform,EPTamminga/Dnn.Platform,valadas/Dnn.Platform,mitchelsellers/Dnn.Platform,mitchelsellers/Dnn.Platform,mitchelsellers/Dnn.Platform,EPTamminga/Dnn.Platform,EPTamminga/Dnn.Platform,nvisionative/Dnn.Platform,bdukes/Dnn.Platform,mitchelsellers/Dnn.Platform,valadas/Dnn.Platform,valadas/Dnn.Platform,dnnsoftware/Dnn.Platform,dnnsoftware/Dnn.Platform,valadas/Dnn.Platform