Only specify parameters if non-empty

Specifying empty string throws an error for certain actions such
as Submit that don't take any params.

Release-Notes: skip
Bug: Google b/431939712
Change-Id: I70286a46abf94c6ddaee2f8615b608a2a86a075e

polygerrit-ui/app/elements/change/gr-flows/gr-create-flow.ts

diff --git a/polygerrit-ui/app/elements/change/gr-flows/gr-create-flow.ts b/polygerrit-ui/app/elements/change/gr-flows/gr-create-flow.ts
index 19c06c2..fb24a06 100644
--- a/polygerrit-ui/app/elements/change/gr-flows/gr-create-flow.ts
+++ b/polygerrit-ui/app/elements/change/gr-flows/gr-create-flow.ts
@@ -299,7 +299,9 @@
           const action: {name: string; parameters?: string[]} = {
             name: stage.action,
           };
-          action.parameters = stage.parameterStr.split(' ');
+          if (stage.parameterStr.length > 0) {
+            action.parameters = stage.parameterStr.split(' ');
+          }
           return {
             condition: stage.condition,
             action,

polygerrit-ui/app/elements/change/gr-flows/gr-create-flow_test.ts

diff --git a/polygerrit-ui/app/elements/change/gr-flows/gr-create-flow_test.ts b/polygerrit-ui/app/elements/change/gr-flows/gr-create-flow_test.ts
index 3b5930a..16e1fdb 100644
--- a/polygerrit-ui/app/elements/change/gr-flows/gr-create-flow_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-flows/gr-create-flow_test.ts
@@ -151,7 +151,7 @@
       {
         condition:
           'https://gerrit-review.googlesource.com/c/plugins/code-owners/+/441321 is single condition',
-        action: {name: 'single action', parameters: ['']},
+        action: {name: 'single action'},
       },
     ]);
   });
@@ -243,12 +243,12 @@
       {
         condition:
           'https://gerrit-review.googlesource.com/c/plugins/code-owners/+/441321 is cond 1',
-        action: {name: 'act 1', parameters: ['']},
+        action: {name: 'act 1'},
       },
       {
         condition:
           'https://gerrit-review.googlesource.com/c/plugins/code-owners/+/441321 is cond 2',
-        action: {name: 'act 2', parameters: ['']},
+        action: {name: 'act 2'},
       },
     ]);
   });
@@ -295,12 +295,12 @@
       {
         condition:
           'https://gerrit-review.googlesource.com/c/plugins/code-owners/+/441321 is cond 1',
-        action: {name: 'act 1', parameters: ['']},
+        action: {name: 'act 1'},
       },
       {
         condition:
           'https://gerrit-review.googlesource.com/c/plugins/code-owners/+/441321 is cond 2',
-        action: {name: 'act 2', parameters: ['']},
+        action: {name: 'act 2'},
       },
     ]);
   });