fix Image for non-existing textures in atlas

src/graphics/core/Atlas.cpp

@@ -34,6 +34,14 @@ const UVRegion& Atlas::get(const std::string& name) const {
     return regions.at(name);
 }
 
+std::optional<UVRegion> Atlas::getIf(const std::string& name) const {
+    const auto& found = regions.find(name);
+    if (found == regions.end()) {
+        return std::nullopt;
+    }
+    return found->second;
+}
+
 Texture* Atlas::getTexture() const {
     return texture.get();
 }

src/graphics/core/Atlas.hpp

@@ -5,6 +5,7 @@
 #include <string>
 #include <memory>
 #include <vector>
+#include <optional>
 #include <unordered_map>
 #include "../../maths/UVRegion.hpp"
 #include "../../typedefs.hpp"
@@ -31,6 +32,7 @@ public:
 
     bool has(const std::string& name) const;
     const UVRegion& get(const std::string& name) const;
+    std::optional<UVRegion> getIf(const std::string& name) const;
 
     Texture* getTexture() const;
     ImageData* getImage() const;