[libcalamares] Add query for kpmcore status

src/libcalamares/partition/KPMManager.cpp

@@ -44,7 +44,6 @@ static bool s_kpm_loaded = false;
 static bool s_loaded = false;
 static std::shared_ptr< InternalManager > s_backend;
 
-
 InternalManager::InternalManager()
 {
     Q_ASSERT( !s_loaded );
@@ -100,5 +99,11 @@ KPMManager::KPMManager()
 
 KPMManager::~KPMManager() {}
 
+KPMManager::operator bool() const
+{
+    return s_kpm_loaded;
+}
+
+
 }  // namespace Partition
 }  // namespace CalamaresUtils

src/libcalamares/partition/KPMManager.h

@@ -48,8 +48,11 @@ public:
     KPMManager();
     ~KPMManager();
 
+    /// @brief Is KPMCore loaded correctly?
+    operator bool() const;
 private:
     std::shared_ptr< InternalManager > m_d;
+
 };
 
 }  // namespace Partition