Description

@HenkMutsaerts: if in Develop branch, I enter "ExploreASL([],0,0) it should initialize (same as "ExploreASL"). But if I enter "ExploreASL('pathtoRootDataSet',0,0), it doesn't issue a warning if the dataset is missing & cannot be loaded.

Requirements

So for the steps:

1. Initialize (run always)
2. Import (skipped for 0)
3. Load dataset (run always if first input argument is not empty)
4. Process dataset (skipped for 0)
   Then here in part 3, we need a warning if the folder is not a folder, or if the dataPar file is missing, right? It may just fprintf the warning instead of a full warning

Release notes

Improve warnings (data loading)