(flutter) add zero size check in TextureWidget

thermion_flutter/thermion_flutter/lib/src/widgets/src/thermion_texture_widget.dart

@@ -94,6 +94,7 @@ class _ThermionTextureWidgetState extends State<ThermionTextureWidget> {
       var width = (size.width * dpr).ceil();
       var height = (size.height * dpr).ceil();
 
+      if (width > 0 && height > 0) {
         _logger.info(
             "Target texture dimensions ${width}x${height} (pixel ratio : $dpr)");
 
@@ -114,6 +115,9 @@ class _ThermionTextureWidgetState extends State<ThermionTextureWidget> {
           _logger.severe(err);
           _logger.severe(st);
         }
+      } else {
+        _logger.warning("Widget has zero width or height");
+      }
 
       if (mounted) {
         setState(() {});