minor bugs

Author: sawka

frontend/app/view/processviewer/processviewer.tsx

@@ -311,6 +311,10 @@ export class ProcessViewerViewModel implements ViewModel {
             this.cancelPoll = null;
             this.startKeepAlive();
         } else {
+            if (this.cancelPoll) {
+                this.cancelPoll();
+            }
+            this.cancelPoll = null;
             this.startPolling();
         }
     }

pkg/wshrpc/wshremote/processviewer.go

@@ -160,7 +160,9 @@ func (s *procCacheState) getWidgetPidOrder(widgetId string) ([]int32, int) {
 func (s *procCacheState) updateCacheAndCheckIdle(result *wshrpc.ProcessListResponse, firstDone *bool, firstReadyCh chan struct{}) bool {
 	s.lock.Lock()
 	defer s.lock.Unlock()
-	s.cached = result
+	if result != nil {
+		s.cached = result
+	}
 	if !*firstDone {
 		*firstDone = true
 		close(firstReadyCh)
@@ -254,7 +256,10 @@ func (s *procCacheState) collectSnapshot(numCPU int) *wshrpc.ProcessListResponse
 		s.lastCPUSamples = make(map[int32]cpuSample, len(procs))
 	}
 
-	snap, _ := procinfo.MakeGlobalSnapshot()
+	snap, err := procinfo.MakeGlobalSnapshot()
+	if err != nil {
+		return nil
+	}
 
 	hasCPU := s.lastCPUEpoch > 1 // first epoch has no previous sample to diff against