correctly identifying 4d runs in post scripts and fixing a bug in profile

• since we started using event spin instead of zero, the criterion for identifying 4D intrinsic grid is wrongly defined in the plot_intrinsic_potserior.py
• if some ILE jobs fail due to some error after they started, it still creates a profile stat file. But, we might not find all functions we need inside the stat file. Fixed #104 (closed). The changes in this commit are, - put the contents inside the for loop (line 95) in try...except - make plots only if non-empty we have non-empty list after the loop