make sure footer sticks to the bottom of the page.

better "empty" view for sourcs

fixes fastenhealth/docs#14

frontend/src/app/components/footer/footer.component.html

@@ -1,4 +1,4 @@
-<div class="az-footer ht-40">
+<div class="az-footer ht-40 page-footer fixed-bottom">
   <div class="container ht-100p pd-t-0-f">
     <div class="d-sm-flex justify-content-center justify-content-sm-between py-2 w-100">
       <span class="text-muted text-center text-sm-left d-block d-sm-inline-block">Copyright © Fasten 2022</span>

frontend/src/app/pages/source-detail/source-detail.component.html

@@ -1,5 +1,5 @@
 <div class="az-content">
-  <div class="container">
+  <div *ngIf="resourceTypeCounts" class="container">
     <div class="az-content-left">
       <ul class="list-group">
         <li *ngFor="let resourceGroup of resourceTypeCounts | keyvalue" (click)="selectResourceType(resourceGroup.key)" class="list-group-item d-flex justify-content-between align-items-center">
@@ -18,4 +18,15 @@
 
     </div><!-- az-content-body -->
   </div><!-- container -->
+
+  <div class="container">
+    <div class="az-error-wrapper">
+      <h1>{{selectedSource.source_type}}</h1>
+      <h2>No resources found for this Healthcare provider</h2>
+      <h6>You may need to re-authenticate to this source, or wait for the resources to sync.</h6>
+      <a routerLink="/sources" class="btn btn-outline-indigo">Sources</a>
+    </div>
+
+  </div>
+
 </div><!-- az-content -->