Dont send null to Jira.

Author: dpnova

README.md

@@ -12,7 +12,7 @@ To update the fields of an issue you need to specify an issue key and field data
 
 ```yaml
 - name: Comment on issue
-  uses: kherP/[email protected].1
+  uses: kherP/[email protected].2
   with:
   issue: INC-2;INC-3
   fields: customfield_10006=https://www.google.com;customfield_10007=4

action.js

@@ -17,8 +17,9 @@ module.exports = class {
     const { fields } = this.argv
     console.log(this.argv, this.config)
     console.log(`updating ${issueIds} with \n${fields}`)
-    await this.Jira.updateField(issueIds, fields)
-
+    if(issueIds !== null){
+      await this.Jira.updateField(issueIds, fields)
+    }
     return {}
   }
 }