Code insight charts may have weird negative y-labels

Created by: vovakulikov

Steps to reproduce:

1. Go to code insight charts
2. Notice that some charts have strange negative y-labels. (see image below)

Expected behaviour:

For some charts we have to clamp first lowest y value by some number (In the case in the picture above, we should limit the lower Y bound to zero)

Actual behavior:

Having a negative value in charts where it doesn't make any sense.