zc.recipe.egg: `:egg` might be missing

-> in such a case the recipe uses section name as the default name for installed egg.

nxdbom/__init__.py

@@ -154,7 +154,7 @@ def bom_software(installed_software_path): # -> {} name -> PkgInfo
             # TODO it is better to fix zc.recipe.egg to save the full information, so that we can build BOM just from .installed.cfg
             eggdir = part['_e']
             eggdev = part['_d']
-            eggs = part['eggs'].split('\n')
+            eggs = part.get('eggs', part.name).split('\n')
             for eggname in eggs:
                 m = _egg_re.match(eggname)
                 assert m is not None, eggname

nxdbom/nxdbom_test.py

@@ -194,6 +194,18 @@ eggs = pygolang
 pygolang                     0.1        https://pypi.org/project/pygolang/0.1/
 """)
 
+# no `eggs =`
+case1("""\
+[selenium]
+recipe = zc.recipe.egg
+_d = /ROOT/develop-eggs
+_e = /ROOT/eggs
+-- /ROOT/eggs/selenium-3.141.0-py2.7.egg/x --
+""", """
+>>> eggs:
+selenium                     3.141.0    https://pypi.org/project/selenium/3.141.0/
+""")
+
 # %20 in URL
 case1("""\
 [zabbix-agent]