Minor improvement to logging in post-action

- Ensure that "Caching Gradle state" group always has 1 message
- Only print cache report when entries were restored or saved

src/cache-base.ts

@@ -185,7 +185,7 @@ export abstract class AbstractCache {
 
     async save(listener: CacheListener): Promise<void> {
         if (!this.cacheOutputExists()) {
-            this.debug(`No ${this.cacheDescription} to cache.`)
+            core.info(`No ${this.cacheDescription} to cache.`)
             return
         }
 
@@ -193,7 +193,7 @@ export abstract class AbstractCache {
         const cacheResult = core.getState(this.cacheResultStateKey)
 
         if (!cacheKey) {
-            this.debug(`${this.cacheDescription} existed prior to cache restore. Not saving.`)
+            core.info(`${this.cacheDescription} existed prior to cache restore. Not saving.`)
             return
         }
 

src/caches.ts

@@ -54,6 +54,10 @@ export async function save(): Promise<void> {
 }
 
 function logCachingReport(listener: CacheListener): void {
+    if (listener.cacheEntries.length === 0) {
+        return
+    }
+
     core.info(`---------- Caching Summary -------------
 Restored Entries Count: ${getCount(listener.cacheEntries, e => e.restoredSize)}
                   Size: ${getSum(listener.cacheEntries, e => e.restoredSize)}