Importing a Google Sheet including blank cells (default is ragged array)

Change the URL to request the data in CSV format from Google Sheets (instead of HTML, which is perhaps not the best format for structured tabular data):

Import["https://docs.google.com/spreadsheets/d/1F3uGfNJH-hch3NfnvZvqzg8vqmMLUkMF2dgAsHPP66s/gviz/tq?tqx=out:csv&tq&gid=0", "CSV"]

In version 10.1 it appears "FullData" will do this, but it also produces some extra fluff that will need to be trimmed.

dat = Import[
   "https://docs.google.com/spreadsheets/d/1F3uGfNJH-\
hch3NfnvZvqzg8vqmMLUkMF2dgAsHPP66s/gviz/tq?tqx=out:html&tq&gid=0", "FullData"];

dat[[2, 2 ;;, ;; 7]] // Grid // TeXForm

$\begin{array}{ccccccc} 341367901 & \text{} & 0 & 0 & 0 & \text{} & 0 \\ 341367902 & \text{} & 0 & 0 & 0 & \text{} & 0 \\ 341367903 & \text{} & 0 & 0 & 0 & \text{} & 0 \\ 341367904 & \text{} & 0 & 0 & 0 & \text{} & 0 \\ 341367905 & \text{} & 0 & 0 & 0 & \text{} & 0 \\ 341367906 & \text{} & 0 & 0 & 0 & \text{} & 0 \\ 341367907 & \text{} & 0 & 0 & 0 & \text{} & 0 \\ 341367908 & 6.3 & 6.3 & 0 & 0 & \text{} & 0 \\ 341367909 & 5.3 & 11.6 & 0 & 0 & \text{} & 0 \\ 341367910 & 5 & 16.6 & 0 & 0 & \text{} & 0 \\ 341367911 & 5.8 & 22.4 & 0 & 0 & \text{} & 0 \\ 341367912 & 5.4 & 27.8 & 0 & 0 & \text{} & 0 \\ 341367913 & 5.4 & 33.2 & 0 & 0 & 278 & 278 \\ 341367914 & 5.3 & 38.5 & 0 & 0 & \text{} & 278 \\ 341367915 & 6.2 & 44.7 & 0 & 0 & \text{} & 278 \\ 341367916 & 1 & 45.7 & 0 & 0 & \text{} & 278 \\ 341367917 & 4 & 49.7 & 0 & 0 & \text{} & 278 \\ 341367918 & \text{} & 49.7 & 0 & 0 & \text{} & 278 \\ 341367919 & 3.6 & 53.3 & 0 & 0 & 219 & 497 \\ 341367920 & \text{} & 53.3 & 0 & 0 & \text{} & 497 \\ 341367921 & \text{} & 53.3 & 0 & 0 & \text{} & 497 \\ 341367922 & 3.9 & 57.2 & 0 & 0 & \text{} & 497 \\ 341367923 & 7 & 64.2 & 0 & 0 & \text{} & 497 \\ 341367924 & 5.9 & 70.1 & 0 & 0 & \text{} & 497 \\ 341367925 & 5.6 & 75.7 & 0 & 0 & \text{} & 497 \\ 341367926 & 5.9 & 81.6 & 0 & 0 & 260 & 757 \\ 341367927 & \text{} & 81.6 & 0 & 0 & \text{} & 757 \\ \end{array}$