AzureMonitorDatasource: Add bounds check to fix panics (#110879)

(azure-monitor-datasource): add bounds check to fix panics

pkg/tsdb/azuremonitor/loganalytics/azure-log-analytics-datasource.go

@@ -573,6 +573,10 @@ func addTraceDataLinksToFields(query *AzureLogAnalyticsQuery, azurePortalBaseUrl
 		return err
 	}
 
+	if len(queryJSONModel.AzureTraces.Resources) == 0 {
+		return fmt.Errorf("no resources specified for Azure traces data link")
+	}
+
 	traceIdVariable := "${__data.fields.traceID}"
 	resultFormat := dataquery.ResultFormatTrace
 	queryJSONModel.AzureTraces.ResultFormat = &resultFormat
@@ -668,6 +672,9 @@ func (e *AzureLogAnalyticsDatasource) createRequest(ctx context.Context, queryUR
 	if query.AppInsightsQuery {
 		// If the query type is traces then we only need the first resource as the rest are specified in the query
 		if query.QueryType == dataquery.AzureQueryTypeAzureTraces {
+			if len(query.Resources) == 0 {
+				return nil, fmt.Errorf("no resources specified for Azure traces Application Insights query")
+			}
 			body["applications"] = []string{query.Resources[0]}
 		} else {
 			body["applications"] = query.Resources