[welcome] Use convenience function

- Introduce a hasDetails() for RequirementEntry, which is just
   a short-cut, but makes code more readable.

src/libcalamaresui/modulesystem/Requirement.h

@@ -45,14 +45,17 @@ struct RequirementEntry
     /// @brief name of this requirement; not shown to user and used as ID
     QString name;
 
-    /// @brief Description of this requirement, for use in user-visible lists
+    /// @brief Detailed description of this requirement, for use in user-visible lists
     TextFunction enumerationText;
 
-    /// @brief User-visible string to show that the requirement is not met
+    /// @brief User-visible string to show that the requirement is not met, short form
     TextFunction negatedText;
 
     bool satisfied;
     bool mandatory;
+
+    /// @brief Convenience to check if this entry should be shown in details dialog
+    bool hasDetails() const { return !enumerationText().isEmpty(); }
 };
 
 using RequirementsList = QList< RequirementEntry >;

src/modules/welcome/checker/ResultsListWidget.cpp

@@ -179,7 +179,7 @@ ResultsListWidget::showDetailsDialog( const Calamares::RequirementsList& checkEn
 
     for ( const auto& entry : checkEntries )
     {
-        if ( entry.enumerationText().isEmpty() )
+        if ( !entry.hasDetails() )
             continue;
 
         ResultWidget* ciw = new ResultWidget( entry.satisfied, entry.mandatory );