Since Diabetics (T1 or T2) don't fall into the COVID19 higher risk category, it's no surprise that you don't have to self isolate.
However it is only sensible to practice Social Distancing as much as possible because all the stats from China, Korea, Italy seem to show more deaths among diabetics , but with no breakdown as to Type and whether well or badly controlled.
Neither is there any sign of a scientific theory as to why more diabetics should have died - unless the Covid19 infection causes their BG levels to spike high enough to do it.