Bug fix : NPE when the first SurfaceLine of a Surface is null in...

Bug fix : NPE when the first SurfaceLine of a Surface is null in rebuildPixelsArray() method in ReferenceSurfaceExtraction.
Addition of GetWidth and getHeight methods

src/main/java/fr/pasteur/ida/zellige/main/Main.java

@@ -57,9 +57,9 @@ public class Main
 
         // Input of the image.
         final String imagePath =
-        "doc/STK.tif";
+//        "doc/STK.tif";
 //        "C:\\Users\\ctrebeau\\Desktop\\MoucheAile\\STK\\STK_Mouche_c01_f0001_p005.tif";
-//        "C:\\Users\\ctrebeau\\Downloads\\phantom3b_combined.tif";
+        "C:\\Users\\ctrebeau\\Downloads\\phantom3b_combined.tif";
 //                "C:\\Users\\ctrebeau\\Desktop\\HighRes\\STK_170706_Vangl2-Lp-wt_E14.5_Phall_cochlea_01bHighRes_c01_f0001_p005.tif";
         System.out.println(imagePath);
         // Creation of the image : version with unsigned type. */

src/main/java/fr/pasteur/ida/zellige/surfaceConstruction/construction/ReferenceSurfaceExtraction.java

@@ -103,8 +103,8 @@ public class ReferenceSurfaceExtraction< T extends RealType< T > & NativeType< T
      */
     private  Pixels[][] rebuildPixelsArray( Surface surface )
     {
-        int width = surface.get().length;
-        int height = surface.get()[0].getLength();
+        int width = surface.getHeight();
+        int height = surface.getWidth();
         Pixels[][] tempCoordinates = new Pixels[ height ][ width ]; // Transposed array
         for ( int i = 0; i <= width - 1; i++ )
         {

src/main/java/fr/pasteur/ida/zellige/surfaceConstruction/element/Surface.java

@@ -306,7 +306,18 @@ public class Surface
     }
 
 
-
+    public int getWidth()
+    {
+        for ( SurfaceLine surfaceLine: surfaceLines
+               )
+        {
+            if (surfaceLine !=  null)
+            {
+                return surfaceLine.getLength();
+            }
+        }
+        return 0;
+    }
     public int getHeight()
     {
         return this.surfaceLines.length;