BaseTools/Source/Python: Verify TAB_TOD_DEFINES_FAMILY key present

BaseTools/Source/Python: Verify TAB_TOD_DEFINES_FAMILY key present

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3344

Veify that TAB_TOD_DEFINES_FAMILY key is present in ToolDef
dictionary before access.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>