set ZKAPP_ACCOUNT_KEY_FILE & ZKAPP_ACCOUNT_PUB_KEY only if ZKAPP_TRANSACTIONS is true to avoid reading non-existent files

Author: glyh

scripts/mina-local-network/mina-local-network.sh

@@ -844,8 +844,10 @@ printf "\n"
 if ${VALUE_TRANSFERS} || ${ZKAPP_TRANSACTIONS}; then
   FEE_PAYER_KEY_FILE=${LEDGER_FOLDER}/offline_whale_keys/offline_whale_account_0
   SENDER_KEY_FILE=${LEDGER_FOLDER}/offline_whale_keys/offline_whale_account_1
-  ZKAPP_ACCOUNT_KEY_FILE=${LEDGER_FOLDER}/zkapp_keys/zkapp_account
-  ZKAPP_ACCOUNT_PUB_KEY=$(cat ${LEDGER_FOLDER}/zkapp_keys/zkapp_account.pub)
+  if ${ZKAPP_TRANSACTIONS}; then
+    ZKAPP_ACCOUNT_KEY_FILE=${LEDGER_FOLDER}/zkapp_keys/zkapp_account
+    ZKAPP_ACCOUNT_PUB_KEY=$(cat "${LEDGER_FOLDER}/zkapp_keys/zkapp_account.pub")
+  fi
 
   KEY_FILE=${LEDGER_FOLDER}/online_fish_keys/online_fish_account_0
   PUB_KEY=$(cat "${LEDGER_FOLDER}"/online_fish_keys/online_fish_account_0.pub)