Revert "Don't swallow Exception happening inside dockerExecOnK8S.stashWorkspace (#1071)" (#1074)

This reverts commit e64895e022.

vars/dockerExecuteOnKubernetes.groovy

@@ -247,24 +247,13 @@ void executeOnPod(Map config, utils, Closure body, Script script) {
                     }
                     echo "ContainerConfig: ${containerParams}"
                     container(containerParams) {
-                        Exception e
                         try {
                             utils.unstashAll(stashContent)
                             echo "invalidate stash workspace-${config.uniqueId}"
                             stash name: "workspace-${config.uniqueId}", excludes: '**/*', allowEmpty: true
                             body()
-                        } catch(Exception e1) {
-                            e = e1
                         } finally {
-                            try {
-                                stashWorkspace(config, 'container', true, true)
-                            } catch(Exception e2) {
-                                if(e) {
-                                    e.addSuppressed(e2)
-                                    throw e
-                                }
-                                throw e2
-                            }
+                            stashWorkspace(config, 'container', true, true)
                         }
                     }
                 } else {
@@ -327,8 +316,8 @@ chown -R ${runAsUser}:${fsGroup} ."""
         return stashName
     } catch (AbortException | IOException e) {
         echo "${e.getMessage()}"
-        throw e
     }
+    return null
 }
 
 private Map getSecurityContext(Map config) {