Update span_selector.py

Author: Jashshah6086

examples/widgets/span_selector.py

@@ -29,13 +29,15 @@
 def onselect(xmin, xmax):
     indmin, indmax = np.searchsorted(x, (xmin, xmax))
     indmax = min(len(x) - 1, indmax)
-
+    
     region_x = x[indmin:indmax]
     region_y = y[indmin:indmax]
-    line2.set_data(region_x, region_y)
-    ax2.set_xlim(region_x[0], region_x[-1])
-    ax2.set_ylim(region_y.min(), region_y.max())
-    fig.canvas.draw()
+    
+    if len(region_x) >= 2:
+        line2.set_data(region_x, region_y)
+        ax2.set_xlim(region_x[0], region_x[-1])
+        ax2.set_ylim(region_y.min(), region_y.max())
+        fig.canvas.draw()
 
 #############################################################################
 # .. note::