hack for older setuptools_scm calls

that don't support the fallback_version option

gwinc/__init__.py

@@ -9,7 +9,12 @@ try:
     from ._version import version as __version__
 except ModuleNotFoundError:
     import setuptools_scm
-    __version__ = setuptools_scm.get_version(fallback_version='?.?.?')
+    try:
+        __version__ = setuptools_scm.get_version(fallback_version='?.?.?')
+    # FIXME: fallback_version is not available in the buster version
+    # (3.2.0-1)
+    except TypeError:
+        __version__ = '?.?.?'
 from .ifo import IFOS
 from .struct import Struct
 from .plot import plot_budget