fix: undefined gauge hash (#10948)

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<!-- start pr-codex -->

---

## PR-Codex overview
This PR focuses on improving the filtering of `gauges` in the
`useUserVoteGauges` hook to ensure only valid gauges with a `hash` are
processed when creating the `contracts` array.

### Detailed summary
- Added a `.filter((g) => !!g.hash)` to ensure only gauges with a valid
`hash` are included.
- The structure of the `contracts` array creation remains the same, but
now excludes any invalid gauges.

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question}`

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apps/web/src/views/GaugesVoting/hooks/useUserVoteGauges.ts

@@ -44,13 +44,15 @@ export const useUserVoteSlopes = () => {
       const hasProxy =
         userInfo?.cakePoolProxy && !isAddressEqual(userInfo?.cakePoolProxy, zeroAddress) && userInfo && !delegated
 
-      const contracts = gauges.map((gauge) => {
-        return {
-          ...gaugesVotingContract,
-          functionName: 'voteUserSlopes',
-          args: [account, gauge.hash as Hex],
-        } as const
-      })
+      const contracts = gauges
+        .filter((g) => !!g.hash)
+        .map((gauge) => {
+          return {
+            ...gaugesVotingContract,
+            functionName: 'voteUserSlopes',
+            args: [account, gauge.hash as Hex],
+          } as const
+        })
 
       if (hasProxy) {
         gauges.forEach((gauge) => {