Afegir missatge quan no hi ha assignatures actuals

Quan el mètode getCurrentClasses no retorna cap classe, ara en comptes
de mostrar-se la pàgina en blanc es mostra un missatge que indica que no
s'està impartint cap classe en aquests moments.

(cherry picked from commit 63687f4ea10e44cffd2b5456144bb2779ee95b5b)
diff --git a/css/bulma-adjustments.css b/css/bulma-adjustments.css
index 8931934..80cc33a 100644
--- a/css/bulma-adjustments.css
+++ b/css/bulma-adjustments.css
@@ -1,3 +1,7 @@
+html {
+    min-width: auto;
+}
+
 .buttons.grid {
     display: flex;
     flex-direction: row;
@@ -24,26 +28,26 @@
 }
 
 #dev-mode {
-  background: #d23f31;
-  border: 1px solid #3e2723;
-  box-shadow: 0 0 4px rgba(0,0,0,.14), 0 2px 4px rgba(0,0,0,.28);
-  color: #fff;
-  font-size: 10px;
-  font-weight: 700;
-  right: 20px;
-  line-height: 18px;
-  margin: -9px -50px;
-  opacity: .87;
-  position: absolute;
-  text-align: center;
-  text-shadow: 1px 1px 0 #4e342e;
-  top: 20px;
-  transform: rotate(45deg);
-  width: 100px;
-  z-index: 99;
-  cursor: pointer;
+    background: #d23f31;
+    border: 1px solid #3e2723;
+    box-shadow: 0 0 4px rgba(0,0,0,.14), 0 2px 4px rgba(0,0,0,.28);
+    color: #fff;
+    font-size: 10px;
+    font-weight: 700;
+    right: 20px;
+    line-height: 18px;
+    margin: -9px -50px;
+    opacity: .87;
+    position: absolute;
+    text-align: center;
+    text-shadow: 1px 1px 0 #4e342e;
+    top: 20px;
+    transform: rotate(45deg);
+    width: 100px;
+    z-index: 99;
+    cursor: pointer;
 }
 
-#dev-mode.hidden {
-  display: none;
-}
\ No newline at end of file
+.hidden {
+    display: none;
+}
diff --git a/index.html b/index.html
index d9ef116..e66e216 100644
--- a/index.html
+++ b/index.html
@@ -134,6 +134,11 @@
             })
                 .then(response => response.json())
                 .then(data => {
+                    if (data.payload.classes.length == 0) {
+                        document.getElementById('no-subjects').classList.remove('hidden');
+                    }
+
+
                     for (var classe of data.payload.classes) {
                         console.log(classe);
 
@@ -219,6 +224,7 @@
             </div><br>
             -->
             <div id="subject-container" class="grid buttons"></div><br>
+            <div id="no-subjects" class="hidden">No s'està impartint cap classe en aquests moments.</div>
             
         </section>