abi/base: return error for pending call error (#24649)

If a pending contract call errors, return that error right away rather
than ignoring it to allow an error somewhere else. This is helpful for
callers to know if perhaps a call failed because of the context deadline
being expired. This change mirrors the behavior of non-pending contract
calls.

accounts/abi/bind/base.go

@@ -171,7 +171,10 @@ func (c *BoundContract) Call(opts *CallOpts, results *[]interface{}, method stri
 			return ErrNoPendingState
 		}
 		output, err = pb.PendingCallContract(ctx, msg)
-		if err == nil && len(output) == 0 {
+		if err != nil {
+			return err
+		}
+		if len(output) == 0 {
 			// Make sure we have a contract to operate on, and bail out otherwise.
 			if code, err = pb.PendingCodeAt(ctx, c.address); err != nil {
 				return err