Blacklist count may not be correct in some cases about pi-hole

[jacobsalmela]

I think this can be solved with something like this:

numberOf=$(cat $blacklist | sed '/^\s*$/d' | wc -l)

I'll test it some more

[jacobsalmela]

I tested a lot on the Mac and was using this sed 's/^[ \t]*//' to eliminate the tab in front of the number when using wc. It doesn't seem that the Raspbian version of wc has that, so the solution above should work for all the numberOf variables, while accounting for blank lines if they happen to exist.