Try this:
pts = {{}, {}, {{t1, a1, b1, c1}}, {}, {{ti, ai, bi, ci}}}
(* {{}, {}, {{t1, a1, b1, c1}}, {}, {{ti, ai, bi, ci}}} *)
pts /. {} -> Nothing
(* {{{t1, a1, b1, c1}}, {{ti, ai, bi, ci}}} *)
Have fun!
Alexei Boulbitch
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