[erp5_web_renderjs_ui] Clean up service worker code. Remove many `if`.

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_serviceworker.js

@@ -272,18 +272,13 @@
         .then(function () {
           if (!CACHE_KEY) {
             // CLIENT_CACHE_MAPPING_NAME stores CACHE_KEY of each client.
-            return caches.open(CLIENT_CACHE_MAPPING_NAME);
-          }
-        })
+            return caches.open(CLIENT_CACHE_MAPPING_NAME)
               .then(function (erp5js_cache) {
-          if (erp5js_cache) {
                 // Service worker forget everything when it stops. So, when it started
                 // again, CACHE_MAP is empty, get the associated CACHE_KEY from the
                 // special Cache named CLIENT_CACHE_MAPPING_NAME.
                 ERP5JS_CACHE = erp5js_cache;
-            return erp5js_cache.match(client_id);
-          }
-        })
+                return erp5js_cache.match(client_id)
                   .then(function (response) {
                     if (response) {
                       // We use Cache Storage as a persistent database.
@@ -292,16 +287,15 @@
                       console.log("CACHE_KEY from Cache Storage " + CACHE_KEY);
                     }
                   })
-        .then(function () {
-          if (CACHE_KEY) {
-            return [];
+              })
           }
+        })
+        .then(function () {
+          if (!CACHE_KEY) {
             // If associated CACHE_KEY is not found, it means this client is a new one.
             // Let's find the latest Cache.
-          return caches.keys();
-        })
+            return caches.keys()
               .then(function (keys) {
-          if (!CACHE_KEY) {
                 keys = keys.filter(function (key) {return key.startsWith(prefix); });
                 console.log("KEYS = " + keys);
                 if (keys.length) {
@@ -314,6 +308,7 @@
                 // Save the associated CACHE_KEY in a persistent database because service
                 // worker forget everything when it stops.
                 ERP5JS_CACHE.put(client_id, new Response(null, {"statusText": CACHE_KEY}));
+              })
           }
         })
         .then(function () {

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_serviceworker.xml

@@ -228,7 +228,7 @@
             </item>
             <item>
                 <key> <string>serial</string> </key>
-                <value> <string>976.15482.50361.52206</string> </value>
+                <value> <string>976.15605.32654.49476</string> </value>
             </item>
             <item>
                 <key> <string>state</string> </key>
@@ -246,7 +246,7 @@
                     </tuple>
                     <state>
                       <tuple>
-                        <float>1559917201.4</float>
+                        <float>1559924528.42</float>
                         <string>UTC</string>
                       </tuple>
                     </state>