disable token imports on LABS. fix getimports RPC

src/cc/import.cpp

@@ -535,6 +535,8 @@ bool CheckMigration(Eval *eval, const CTransaction &importTx, const CTransaction
 
     uint256 tokenid = zeroid;
     if (vimportOpret.begin()[0] == EVAL_TOKENS) { // for tokens (new opret with tokens)
+        if ( is_STAKED(ASSETCHAINS_SYMBOL) == 1 )
+            return eval->Invalid("no-tokens-migrate-on-LABS");
         struct CCcontract_info *cpTokens, CCtokens_info;
         std::vector<std::pair<uint8_t, vscript_t>>  oprets;
         uint8_t evalCodeInOpret;