handle errors in dep, correctly catch missing url in version check (#65)

* handle errors in dep, correctly catch missing url in version check

replace console.error with throw to handle dep error failures
in main try/catch to mark job as failed in one place

* add test action, prevent failure on empty options

* fix conflict resolution

index.js

@@ -94,8 +94,8 @@ async function dep() {
         break
       }
     }
-    if (url === null) {
-      console.error(`The version "${version}"" does not exist in the "https://deployer.org/manifest.json" file."`)
+    if (typeof url === 'undefined') {
+      core.setFailed(`The version "${version}"" does not exist in the "https://deployer.org/manifest.json" file."`)
     } else {
       console.log(`Downloading "${url}".`)
       await $`curl -LO ${url}`