Added code to sheck if the created circles, rectangles or lines have 0px size.

Author: ggomez91

src/tools/Ellipse.coffee

@@ -20,4 +20,7 @@ module.exports = class Ellipse extends ToolWithStroke
     lc.drawShapeInProgress(@currentShape)
 
   end: (x, y, lc) ->
+    # If there is no height or width, dont save
+    if @currentShape.height == 0 or @currentShape.width == 0
+      return
     lc.saveShape(@currentShape)

src/tools/Line.coffee

@@ -24,4 +24,9 @@ module.exports = class Line extends ToolWithStroke
     lc.drawShapeInProgress(@currentShape)
 
   end: (x, y, lc) ->
+    # If start == end, dont save
+    sameX = @currentShape.x1 == @currentShape.x2
+    sameY = @currentShape.y1 == @currentShape.y2
+    if sameX and sameY
+      return
     lc.saveShape(@currentShape)

src/tools/Rectangle.coffee

@@ -19,4 +19,7 @@ module.exports = class Rectangle extends ToolWithStroke
     lc.drawShapeInProgress(@currentShape)
 
   end: (x, y, lc) ->
+    # If there is no height or width, dont save
+    if @currentShape.height == 0 or @currentShape.width == 0
+      return
     lc.saveShape(@currentShape)