Fix order of column error check in importer

[subins2000]

To set e.Initial, it accesses e.Content[0] but if the content is empty this will cause a runtime error. Moving the emptiness check of Content before e.Initial column check will fix this.

The error before:

2023/07/15 14:54:40 init.go:215: language: english
2023/07/15 14:54:40 init.go:215: language: malayalam
2023/07/15 14:54:40 main.go:172: importing data from ../export.csv ...
panic: runtime error: index out of range [0] with length 0

After:

2023/07/15 14:56:08 main.go:172: importing data from ../export.csv ...
2023/07/15 14:56:08 main.go:174: error reading line 233: empty content (word) at column 1
exit status 1