There doesn't appear to be any rule about failing to arrive, I think these two cover yesterday's situation:
8.36 In the event of a match having to be postponed and one Club is found to be at fault then opponents for that match shall be compensated by the Club at fault. [redacted irrelevant bit] In some instances compensation may also be claimed when neither of the Clubs is at fault. The Board will determine the amount of compensation payments to be made, if any.
8.39 Any Club without just cause failing to fulfil an engagement to play a Competition match on the appointed date shall for each offence be liable to expulsion from the Competition and/ or such other disciplinary action the Board may determine, including the deduction of up to a maximum of three points from the offending Club’s record, any expenses incurred by their opponents, and a fine.
If County were the away team I'd expect us to be arguing we're not at fault for the body on the line, so I assume that's what Dagenham would do, meaning the league's board may compensate both clubs' expenses.