Remove exception printing when importing phonopy (#3696)

Author: lan496

pymatgen/phonon/gruneisen.py

@@ -19,8 +19,7 @@
 try:
     import phonopy
     from phonopy.phonon.dos import TotalDos
-except ImportError as exc:
-    print(exc)
+except ImportError:
     phonopy = None
 
 if TYPE_CHECKING:

pymatgen/phonon/thermal_displacements.py

@@ -22,8 +22,7 @@
 
 try:
     import phonopy
-except ImportError as exc:
-    print(exc)
+except ImportError:
     phonopy = None
 
 __author__ = "J. George"