catch exception when calling make install_python for an installed module.

bin/setup-dunepy.py

@@ -118,10 +118,13 @@ def main(argv):
             moddir = duneModules[1][m]
             pythonModule = toBuildDir(builddir,moddir,m)
             print("calling install_python for %s (%s)" % (m,pythonModule))
-            command = ['cmake', '--build', '.', '--target', 'install_python']
-            proc = subprocess.Popen(command, cwd=pythonModule, stdout = subprocess.PIPE)
-            stdout, stderr = proc.communicate()
-            logger.debug(buffer_to_str(stdout))
+            try:
+                command = ['cmake', '--build', '.', '--target', 'install_python']
+                proc = subprocess.Popen(command, cwd=pythonModule, stdout = subprocess.PIPE)
+                stdout, stderr = proc.communicate()
+                logger.debug(buffer_to_str(stdout))
+            except FileNotFoundError:
+                print("Warning: build dir not found possibly module is installed then python bindings should be already available")
 
 if __name__ == "__main__":
     main(sys.argv[1:])