bd0b558a89
* FIX: paste the spreadsheet to the composer
If we paste spreadsheet with the missing label we receive
`" this \n1 2"`
If we trim whitespace at the beginning then our later calculation to determine if it is a table is incorrect:
```
const columns = rows.map((r) => r.split("\t").length);
const isTable =
columns.reduce((a, b) => a && columns[0] === b && b > 1)
```
https://meta.discourse.org/t/pasting-from-spreadsheet-wont-work-if-corner-cell-is-empty/169443
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