Trade: consistent terminology in an assert message.

src/Magnum/Trade/MeshData.cpp

@@ -140,7 +140,7 @@ MeshData::MeshData(const MeshPrimitive primitive, Containers::Array<char>&& inde
         if(attribute._isOffsetOnly) {
             const std::size_t size = attribute._data.offset + (_vertexCount - 1)*attribute._stride + typeSize;
             CORRADE_ASSERT(!_vertexCount || size <= _vertexData.size(),
-                "Trade::MeshData: offset attribute" << i << "spans" << size << "bytes but passed vertexData array has only" << _vertexData.size(), );
+                "Trade::MeshData: offset-only attribute" << i << "spans" << size << "bytes but passed vertexData array has only" << _vertexData.size(), );
         } else {
             const void* const begin = static_cast<const char*>(attribute._data.pointer);
             const void* const end = static_cast<const char*>(attribute._data.pointer) + (_vertexCount - 1)*attribute._stride + typeSize;

src/Magnum/Trade/Test/MeshDataTest.cpp

@@ -1665,7 +1665,7 @@ void MeshDataTest::constructAttributeNotContained() {
         "Trade::MeshData: attribute 0 [0xbadda9:0xbaddc9] is not contained in passed vertexData array [0xbadda9:0xbaddc1]\n"
         "Trade::MeshData: attribute 1 [0xdead:0xdec5] is not contained in passed vertexData array [0xbadda9:0xbaddc1]\n"
         "Trade::MeshData: attribute 0 [0xbadda9:0xbaddc1] is not contained in passed vertexData array [0x0:0x0]\n"
-        "Trade::MeshData: offset attribute 0 spans 25 bytes but passed vertexData array has only 24\n");
+        "Trade::MeshData: offset-only attribute 0 spans 25 bytes but passed vertexData array has only 24\n");
 }
 
 void MeshDataTest::constructInconsitentVertexCount() {