fixed major tick label text for magick backend

Author: alishdipani

lib/rubyplot/backend/magick_wrapper.rb

@@ -729,7 +729,7 @@ def draw_axes
               @text.pointsize TICK_FONT_SIZE
               @text.font_weight TICK_LABEL_FONT_WEIGHT
               # Changed X and Y coordinates of label for better appearance
-              @text.text((transform_x(x: x_major_tick.coord) - TICK_FONT_SIZE*PIXEL_MULTIPLIERS[:point]),(transform_y(y: v[:y_origin]) + TICK_LABEL_COORD_X_MULTIPLIER*TICK_SIZE_MULTIPLIER*x_major_tick.tick_size), x_major_tick.label)
+              @text.text((transform_x(x: x_major_tick.coord) - TICK_FONT_SIZE*PIXEL_MULTIPLIERS[:point]),(transform_y(y: v[:y_origin]) + TICK_LABEL_COORD_X_MULTIPLIER*TICK_SIZE_MULTIPLIER*x_major_tick.tick_size), x_major_tick.label) unless ( x_major_tick.label.nil? || x_major_tick.label=='')
               @text.font_weight NormalWeight
               # @axes.opacity 1
             end
@@ -748,7 +748,7 @@ def draw_axes
               @text.pointsize TICK_FONT_SIZE
               @text.font_weight TICK_LABEL_FONT_WEIGHT
               # Changed X and Y coordinates of label for better appearance
-              @text.text((transform_x(x: v[:x_origin]) - TICK_LABEL_COORD_Y_MULTIPLIER*TICK_SIZE_MULTIPLIER*y_major_tick.tick_size),(transform_y(y: y_major_tick.coord) + TICK_FONT_SIZE/3*PIXEL_MULTIPLIERS[:point]), y_major_tick.label)
+              @text.text((transform_x(x: v[:x_origin]) - TICK_LABEL_COORD_Y_MULTIPLIER*TICK_SIZE_MULTIPLIER*y_major_tick.tick_size),(transform_y(y: y_major_tick.coord) + TICK_FONT_SIZE/3*PIXEL_MULTIPLIERS[:point]), y_major_tick.label) unless ( y_major_tick.label.nil? || y_major_tick.label=='')
               @text.font_weight NormalWeight
               # @axes.opacity 1
             end