fix: set defaults for backstop data

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@blend-capital/blend-sdk",
-  "version": "2.1.0",
+  "version": "2.1.1",
   "description": "Javascript SDK for the Blend Protocol",
   "type": "module",
   "scripts": {

src/backstop/backstop_pool.ts

@@ -38,7 +38,7 @@ export class BackstopPool {
 
     let emission_config: EmissionConfig | undefined;
     let emission_data: EmissionData | undefined;
-    let poolBalance: PoolBalance | undefined;
+    let poolBalance = new PoolBalance(BigInt(0), BigInt(0), BigInt(0));
     let toGulpEmissions = BigInt(0);
     for (const entry of backstopPoolDataEntries.entries) {
       const ledgerData = entry.val;
@@ -62,9 +62,6 @@ export class BackstopPool {
       }
     }
 
-    if (poolBalance == undefined) {
-      throw new Error('Error: Unable to load backstop pool data');
-    }
     let emissions: Emissions | undefined;
     if (emission_config != undefined && emission_data != undefined) {
       emissions = new Emissions(

src/backstop/backstop_user_types.ts

@@ -47,7 +47,7 @@ export class UserBalance {
       throw Error('UserBalance contract data value is not a map');
     }
 
-    let shares: bigint | undefined;
+    let shares = BigInt(0);
     const q4w: Q4W[] = [];
     let unlockedQ4W = BigInt(0);
     let totalQ4W = BigInt(0);
@@ -93,9 +93,7 @@ export class UserBalance {
           throw Error(`Invalid backstop UserBalance key: should not contain ${key}`);
       }
     }
-    if (shares == undefined) {
-      throw Error("Invalid UserBalance: should contain 'shares'");
-    }
+
     return new UserBalance(shares, q4w, unlockedQ4W, totalQ4W);
   }
 }