I have:

enter image description here

and after using this ogr2ogr call:

ogr2ogr -dialect sqlite -sql "select st_union(geometry) from tmpem122" -explodecollections dissolved.shp tmpem122.shp

I get:

enter image description here

The problem is to remove those small/thin lines that remain in the new polygon.

Is there a way to include/expand the above ogr2ogr call to do this or what other OGR add-on can I use to remove those?

Instead, to try to solve this, I tested this call without sucess (this would solve this issue, if it works):

ogr2ogr -dialect sqlite -sql "select st_makepolygon(st_exteriorring(st_union(geometry))) from tmpem122" -explodecollections OnlyExteriorRing.shp tmpem122.shp

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