Frontend/Fix license list edge cases (#606)

### Requirements List
- _None_

### Description List
- Fixed page-advance breaking after detail view
- Better handle edge case of cache getting cleared on detail view

### Testing List
- `yarn test:unit:all` should run without errors or warnings
- `yarn serve` should run without errors or warnings
- `yarn build` should run without errors or warnings
- Code review
- License search
- As Staff user, perform a license search that will result in multiple
pages of licensees
    - Click on a result row to be navigated to the licensee detail page
    - Return to the list page
    - Attempt to advance to next pages
- Regression: Make sure full license search / results / view flow still
works stably

Closes #604

Author: jsandoval81

webroot/src/components/Licensee/LicenseeList/LicenseeList.ts

@@ -46,15 +46,22 @@ class LicenseeList extends Vue {
     // Lifecycle
     //
     async created() {
-        if (this.licenseStore.model?.length) {
+        if (this.licenseStoreRecordCount) {
             this.hasSearched = true;
         }
     }
 
     async mounted() {
-        if (!this.licenseStore.model?.length) {
+        if (!this.licenseStoreRecordCount) {
+            // License store is empty - apply defaults
             await this.setDefaultSort();
             await this.setDefaultPaging();
+        } else if (this.licenseStoreRecordCount === 1 && !this.searchDisplayAll) {
+            // Edge case: Returning from a detail page that was refreshed / cache-cleared
+            this.shouldShowSearchModal = true;
+        } else {
+            // License store already has records
+            this.isInitialFetchCompleted = true;
         }
     }
 
@@ -77,6 +84,10 @@ class LicenseeList extends Vue {
         return this.$store.state.license;
     }
 
+    get licenseStoreRecordCount(): number {
+        return this.licenseStore.model?.length || 0;
+    }
+
     get searchParams(): LicenseSearch {
         return this.licenseStore.search;
     }