Show a valid error when Internet is off-line while initializing a new project // Resolve #1784

platformio/exception.py

@@ -178,7 +178,7 @@ class InternetIsOffline(PlatformioException):
     MESSAGE = (
         "You are not connected to the Internet.\n"
         "If you build a project first time, we need Internet connection "
-        "to install all dependencies and toolchain.")
+        "to install all dependencies and toolchains.")
 
 
 class LibNotFound(PlatformioException):

platformio/managers/package.py

@@ -414,6 +414,7 @@ class PkgInstallerMixin(object):
                 click.secho("Looking for another mirror...", fg="yellow")
 
         if versions is None:
+            util.internet_on(raise_exception=True)
             raise exception.UnknownPackage(name)
         elif not pkgdata:
             raise exception.UndefinedPackageVersion(requirements or "latest",