Exception when clicking outside single polygon when trying to paint.

When trying to "paint" a polygon, if clicking outside the only polygon in the Geometry object, an exception is raised:

[DEBUG][MainThread] on_paint_button_click--> FlatCAMObj.read_form()
[DEBUG][MainThread] button=1, x=77, y=430, xdata=-0.017330, ydata=2.272231
[DEBUG][MainThread] No active tool to respond to click!
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_qt5.py", line 263, in mousePressEvent
    FigureCanvasBase.button_press_event(self, x, y, button)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/backend_bases.py", line 1870, in button_press_event
    self.callbacks.process(s, mouseevent)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/cbook.py", line 540, in process
    proxy(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/cbook.py", line 415, in __call__
    return mtd(*args, **kwargs)
  File "/home/jpcaram/flatcam/FlatCAMObj.py", line 953, in doit
    self.paint_poly(point, tooldia, overlap)
  File "/home/jpcaram/flatcam/FlatCAMObj.py", line 960, in paint_poly
    poly = find_polygon(self.solid_geometry, inside_pt)
  File "/home/jpcaram/flatcam/camlib.py", line 2920, in find_polygon
    for poly in poly_set:
TypeError: 'Polygon' object is not iterable

Aparently find_polygon is expecting an iterable, but the geometry consists of only a single Polygon.

Action items:

Handle non-iterables
Catch the exception and show error (No polygon found?)

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