Skip whole block if no otel instance

src/otel/OTelGroupCallMembership.ts

@@ -176,7 +176,8 @@ export class OTelGroupCallMembership {
     for (const [userId, userCalls] of calls.entries()) {
       for (const [deviceId, call] of userCalls.entries()) {
         if (!this.callsByCallId.has(call.callId)) {
-          const span = ElementCallOpenTelemetry.instance?.tracer.startSpan(
+          if (ElementCallOpenTelemetry.instance) {
+            const span = ElementCallOpenTelemetry.instance.tracer.startSpan(
               `matrix.call`,
               undefined,
               this.groupCallContext
@@ -194,6 +195,7 @@ export class OTelGroupCallMembership {
           }
         }
       }
+    }
 
     for (const callTrackingInfo of this.callsByCallId.values()) {
       const userCalls = calls.get(callTrackingInfo.userId);