fix: Add check for zero value in tokenFallback

Author: AntonAndell

network-owned-liquidity/src/main/java/icon/inflation/score/nol/Errors.java

@@ -3,6 +3,7 @@
 
 public class Errors {
     public static final String TOKEN_FALLBACK_DATA_EMPTY = "Token Fallback: Data can't be empty";
+    public static final String TOKEN_FALLBACK_ZERO_VALUE = "Token Fallback: Value can't be zero";
     public static final String IRC31_METHOD_NOT_FOUND = "IRC31: method not found";
     public static final String ORDER_LIMIT_REACHED = "Order is above configured limit";
     public static final String LP_OVER_SLIPPAGE_LIMIT = "The price of the liquidity pool is to far off the oracle price of supplied assets";

network-owned-liquidity/src/main/java/icon/inflation/score/nol/NetworkOwnedLiquidity.java

@@ -44,7 +44,7 @@ public class NetworkOwnedLiquidity implements INetworkOwnedLiquidity {
 
     public static final BigInteger DEFAULT_ORDER_PERIOD = BLOCKS_IN_A_MONTH;
     public static final BigInteger DEFAULT_SWAP_REWARDS = BigInteger.valueOf(100); // 1%
-    public static final BigInteger DEFAULT_LP_SLIPPAGE = BigInteger.valueOf(200); // 2%
+    public static final BigInteger DEFAULT_LP_SLIPPAGE = BigInteger.valueOf(100); // 1%
 
     public NetworkOwnedLiquidity(Address _balancedDex, Address _balancedOracle) {
         balancedDex.set(_balancedDex);
@@ -227,6 +227,7 @@ public BigInteger calculateICXReward(BigInteger pid, BigInteger amount) {
     public void onIRC31Received(Address _operator, Address _from, BigInteger _id, BigInteger _value, byte[] _data) {
         only(getBalancedDex());
         String unpackedData = new String(_data);
+        Context.require(_value.compareTo(BigInteger.ZERO) > 0, Errors.TOKEN_FALLBACK_ZERO_VALUE);
         Context.require(!unpackedData.equals(""), Errors.TOKEN_FALLBACK_DATA_EMPTY);
 
         JsonObject json = Json.parse(unpackedData).asObject();