Shaders: initialize all members also with NoCreate.

Otherwise the _lightCount gets a random value, which makes debugging of
accidentally not created instances harder than strictly necessary.

src/Magnum/Shaders/Phong.h

@@ -1017,7 +1017,7 @@ class MAGNUM_SHADERS_EXPORT Phong: public GL::AbstractShaderProgram {
         #endif
 
         Flags _flags;
-        UnsignedInt _lightCount;
+        UnsignedInt _lightCount{};
         Int _transformationMatrixUniform{0},
             _projectionMatrixUniform{1},
             _normalMatrixUniform{2},

src/Magnum/Shaders/Test/DistanceFieldVectorTest.cpp

@@ -58,6 +58,7 @@ template<UnsignedInt dimensions> void DistanceFieldVectorTest::constructNoCreate
     {
         DistanceFieldVector<dimensions> shader{NoCreate};
         CORRADE_COMPARE(shader.id(), 0);
+        CORRADE_COMPARE(shader.flags(), typename DistanceFieldVector<dimensions>::Flags{});
     }
 
     CORRADE_VERIFY(true);

src/Magnum/Shaders/Test/FlatTest.cpp

@@ -60,6 +60,7 @@ template<UnsignedInt dimensions> void FlatTest::constructNoCreate() {
     {
         Flat<dimensions> shader{NoCreate};
         CORRADE_COMPARE(shader.id(), 0);
+        CORRADE_COMPARE(shader.flags(), typename Flat<dimensions>::Flags{});
     }
 
     CORRADE_VERIFY(true);

src/Magnum/Shaders/Test/MeshVisualizerTest.cpp

@@ -67,6 +67,7 @@ void MeshVisualizerTest::constructNoCreate2D() {
     {
         MeshVisualizer2D shader{NoCreate};
         CORRADE_COMPARE(shader.id(), 0);
+        CORRADE_COMPARE(shader.flags(), MeshVisualizer2D::Flags{});
     }
 
     CORRADE_VERIFY(true);
@@ -76,6 +77,7 @@ void MeshVisualizerTest::constructNoCreate3D() {
     {
         MeshVisualizer3D shader{NoCreate};
         CORRADE_COMPARE(shader.id(), 0);
+        CORRADE_COMPARE(shader.flags(), MeshVisualizer3D::Flags{});
     }
 
     CORRADE_VERIFY(true);

src/Magnum/Shaders/Test/PhongTest.cpp

@@ -55,6 +55,8 @@ void PhongTest::constructNoCreate() {
     {
         Phong shader{NoCreate};
         CORRADE_COMPARE(shader.id(), 0);
+        CORRADE_COMPARE(shader.flags(), Phong::Flags{});
+        CORRADE_COMPARE(shader.lightCount(), 0);
     }
 
     CORRADE_VERIFY(true);

src/Magnum/Shaders/Test/VectorTest.cpp

@@ -58,6 +58,7 @@ template<UnsignedInt dimensions> void VectorTest::constructNoCreate() {
     {
         Vector<dimensions> shader{NoCreate};
         CORRADE_COMPARE(shader.id(), 0);
+        CORRADE_COMPARE(shader.flags(), typename Vector<dimensions>::Flags{});
     }
 
     CORRADE_VERIFY(true);