Do not throw errors in build steps if pypandoc is not found. (#84)

Throwing this error is causing issues for users that try to build
packages that depend on pydgraph.

See #82 for more details.

Author: martinmr

setup.py

@@ -23,17 +23,9 @@
 try:
     from pypandoc import convert_file
 except ImportError as e:
-    # NOTE: error is thrown only for package build steps
-    if 'sdist' in sys.argv or 'bdist_wheel' in sys.argv:
-        raise e
-
     def convert_file(f, _):
         return open(f, 'r').read()
 except ModuleNotFoundError as e:
-    # NOTE: error is thrown only for package build steps
-    if 'sdist' in sys.argv or 'bdist_wheel' in sys.argv:
-        raise e
-
     def convert_file(f, _):
         return open(f, 'r').read()