79898 migrate empty exceptions to tool exit with error message (cla: yes, tool, waiting for tree to go green)

79900 Move cache from globals to globals_null_migrated (a: null-safety, cla: yes, team, tool)

79907 Migrate flutter_tool test/src/common to null safety (a: null-safety, cla: yes, team, tool)

79908 Start migrating flutter_tools test src to null safety (a: null-safety, cla: yes, team, tool, waiting for tree to go green)

79917 Allow null Config.getValue() results (a: null-safety, cla: yes, team, tool)

f: material design - 209 pull request(s)